Fait mathématique: 5104 is the smallest number that can be written as the sum of 3 cubes in 3 ways.
Culture générale: 5104 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: December 21st is the day in 1826 that American settlers in Nacogdoches, Mexican Texas, declare their independence, starting the Fredonian Rebellion.