<SUBMISSION>
<ACCESSION-NUMBER>0000904454-06-000691
<TYPE>4
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20061026
<FILING-DATE>20061102
<DATE-OF-FILING-DATE-CHANGE>20061102
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>Sachar Laura B
<CIK>0001346327
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>4
<ACT>34
<FILE-NUMBER>000-51285
<FILM-NUMBER>061183708
</FILING-VALUES>
<BUSINESS-ADDRESS>
<PHONE>212-863-2540
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>C/O STARVEST ASSOCIATES LLC
<STREET2>750 LEXINGTON AVENUE, 15TH FLOOR
<CITY>NEW YORK
<STATE>NY
<ZIP>10022
</MAIL-ADDRESS>
</REPORTING-OWNER>
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>A21 INC
<CIK>0001074436
<ASSIGNED-SIC>7389
<IRS-NUMBER>742896910
<STATE-OF-INCORPORATION>TX
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>A21, INC.
<STREET2>7660 CENTURION PARKWAY
<CITY>JACKSONVILLE
<STATE>FL
<ZIP>32256
<PHONE>9045650066
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>7660 CENTURION PARKWAY
<CITY>JACKSONVILLE
<STATE>FL
<ZIP>32256
</MAIL-ADDRESS>
</ISSUER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2006-10-26</periodOfReport>

    <issuer>
        <issuerCik>0001074436</issuerCik>
        <issuerName>A21 INC</issuerName>
        <issuerTradingSymbol>ATWO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001346327</rptOwnerCik>
            <rptOwnerName>Sachar Laura B</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O STARVEST MANAGEMENT INC.</rptOwnerStreet1>
            <rptOwnerStreet2>750 LEXINGTON AVENUE, 15TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2006-10-26</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>84727</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2006-10-26</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>84727</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>84727</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Starvest Management Inc.</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Shares of restricted stock were awarded to the Reporting Person as a non-employee director of the Issuer on 10/6/2006 and 10/9/2006. Such shares were disposed of to the Issuer on 10/26/2006 and re-issued in the name of StarVest Management Inc.</footnote>
        <footnote id="F2">The Reporting Person owns one-third of the outstanding shares of StarVest Management Inc.  The Reporting Person also indirectly beneficially owns 12,500,000 shares of Common Stock held by StarVest Partners, L.P.  The Reporting Person is one of several managing members of the sole general partner of StarVest Partners, L.P.  Pursuant to Instruction 4(b)(iv) of Form 4, the Reporting Person has elected to report as indirectly beneficially owned the entire number of securities beneficially owned by each such entity.  The Reporting Person disclaims beneficial ownership of any securities, and any proceeds thereof, that exceed his or her pecuniary interest therein, and/or that are not actually distributed to him or her.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Laura B. Sachar</signatureName>
        <signatureDate>2006-11-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
