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 number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 21486 is a boring number.
Fecha histórica: October 28th is the day in 1664 that the Duke of York and Albany's Maritime Regiment of Foot, later to be known as the Royal Marines, is established.