Fait général: 2139 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 2139 is a boring number.
Culture générale: 2139 is an unremarkable number.
Date historique: November 8th is the day in 1965 that the British Indian Ocean Territory is created, consisting of Chagos Archipelago, Aldabra, Farquhar and Des Roches islands.