0000000121385649

0000000121385649 is a 16 character string. The last character is a check character for that string, calculated according ISO 7064 MOD 11-2. The string could be an ISNI according to ISO 27729.
In print an ISNI can be written as four blocks of four characters, in such cases often preceded by the string 'ISNI': ISNI 0000 0001 2138 5649

ISNI based link

ISNI based match

VIAF
https://viaf.org/viaf/71319254