Hecho general: 21494 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 21494 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 21494 is a boring number.
Fecha histórica: November 5th is the day in 1743 that Coordinated scientific observations of the transit of Mercury are organized by Joseph-Nicolas Delisle.