Fait général: 12131 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 12131 is a boring number.
Culture générale: 12131 is a boring number.
Date historique: March 18th is the day in 235 that Emperor Alexander Severus and his mother Julia Mamaea are murdered by legionaries near Moguntiacum (modern Mainz).