ISBN 8021027981 hat failed the check­sum digit test.
The following 18 formally correct ISBNs were determined. Starting from these ISBNs the value 8021027981 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: Indonesia
ISBNas­su­med er­rorCatalogs for checking
602-1027-98-1first digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: former Czechoslovakia
ISBNas­su­med er­rorCatalogs for checking
80-210-2298-1seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-210-2768-1eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-210-2798-3tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-210-2799-1ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-210-2897-17th and 9th digits were swap­ped. amazon.co.uk amazon.com amazon.de
80-210-2978-17th and 8th digits were swap­ped. amazon.co.uk amazon.com amazon.de
80-210-9798-1sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-212-0798-15th and 6th digits were swap­ped. amazon.co.uk amazon.com amazon.de
80-214-2798-1fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-220-1798-14th and 6th digits were swap­ped. amazon.co.uk amazon.com amazon.de
80-260-2798-1fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-280-2791-14th and 9th digits were swap­ped. amazon.co.uk amazon.com amazon.de
80-510-2798-1third digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-910272-8-13rd and 8th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: India
ISBNas­su­med er­rorCatalogs for checking
81-200-2798-12nd and 4th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Norway
ISBNas­su­med er­rorCatalogs for checking
82-01-02798-12nd and 3rd digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Denmark
ISBNas­su­med er­rorCatalogs for checking
87-21-02098-12nd and 7th digits were swap­ped. amazon.co.uk amazon.com amazon.de

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