ISBN 1421506364 hat failed the check­sum digit test.
The following 16 formally correct ISBNs were determined. Starting from these ISBNs the value 1421506364 that you input could have resulted frome one error (error in one digit or transposition of two digits.) You can now check using the links given for the catalogs of amazon.co.uk, amazon.com and amazon.de whether any book is listed for the respective URL. To the home page
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ISBN prefix group: English language
ISBNas­su­med er­rorCatalogs for checking
0-421-51636-41st and 6th digits were swap­ped. amazon.co.uk amazon.com amazon.de
1-02-154636-42nd and 6th digits were swap­ped. amazon.co.uk amazon.com amazon.de
1-121-50636-4second digit was chan­ged. amazon.co.uk amazon.com amazon.de
1-4015-0636-4third digit was chan­ged. amazon.co.uk amazon.com amazon.de
1-4210-5636-45th and 6th digits were swap­ped. amazon.co.uk amazon.com amazon.de
1-4214-0636-55th and 10th digits were swap­ped. amazon.co.uk amazon.com amazon.de
1-4215-0236-4seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
1-4215-0636-Xtenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
1-4215-0639-4ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
1-4215-0656-4eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
1-4215-3606-46th and 8th digits were swap­ped. amazon.co.uk amazon.com amazon.de
1-4215-6036-46th and 7th digits were swap­ped. amazon.co.uk amazon.com amazon.de
1-4216-0636-4fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
1-4255-0636-4fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
1-4512-0636-43rd and 5th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: [no known group prefix]
ISBNas­su­med er­rorCatalogs for checking
6421506364first digit was chan­ged. amazon.co.uk amazon.com amazon.de

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