Hecho matemático: 71217 is an unremarkable number.
Trivia: 71217 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fecha histórica: December 25th is the day in 1261 that John IV Lascaris of the restored Eastern Roman Empire is deposed and blinded by orders of his co-ruler Michael VIII Palaeologus.