Hecho matemático: 55215 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 55215 is an uninteresting number.
Fecha histórica: March 4th is the day in 1933 that the Parliament of Austria is suspended because of a quibble over procedure – Chancellor Engelbert Dollfuss initiates an authoritarian rule by decree.