Fait général: 9721 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 9721 is the largest prime factor of 1234567.
Culture générale: 9721 is an uninteresting number.
Date historique: August 12th is the day in 1953 that the islands of Zakynthos and Kefalonia in Greece are severely damaged by an earthquake measuring 7.3 on the Richter scale.