Hecho general: 21486 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 21486 is a boring number.
Trivia: 21486 is a boring number.
Fecha histórica: October 28th is the day in 1982 that the Spanish Socialist Workers' Party wins elections, leading to the first Socialist government in Spain after death of Franco.