ISBN 0234484521 hat failed the check­sum digit test.
The following 11 formally correct ISBNs were determined. Starting from these ISBNs the value 0234484521 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
0-214-48452-1third digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-234-47452-1sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-234-48052-1seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-234-48452-7tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-234-48455-1ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-234-48472-1eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-234-58452-1fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-238-48452-1fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-434-28452-12nd and 5th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: German language
ISBNas­su­med er­rorCatalogs for checking
3-204-48452-11st and 3rd digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: former U.S.S.R
ISBNas­su­med er­rorCatalogs for checking
5-234-48452-1first digit was chan­ged. amazon.co.uk amazon.com amazon.de

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