Fait général: 2721 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 2721 is an uninteresting number.
Culture générale: 2721 is an uninteresting number.
Date historique: June 13th is the day in 1966 that the United States Supreme Court rules in Miranda v. Arizona that the police must inform suspects of their rights before questioning them.