Fait général: 2321 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 2321 is a Huay rhombic dodecahedral number.
Culture générale: 2321 is an unremarkable number.
Date historique: May 9th is the day in 1877 that a magnitude 8.8 earthquake off the coast of Peru kills 2,541, including some as far away as Hawaii and Japan.