Hecho matemático: 85213 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 85213 is an uninteresting number.
Fecha histórica: April 21st is the day in 1894 that Norway formally adopts the Krag-Jørgensen rifle as the main arm of its armed forces, a weapon that would remain in service for almost 50 years.