Fait général: 15216 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 15216 is a boring number.
Culture générale: 15216 is an uninteresting number.
Date historique: August 28th is the day in 489 that Theodoric, king of the Ostrogoths defeats Odoacer at the Battle of Isonzo, forcing his way into Italy.