Hecho general: 5215 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 5215 is an uninteresting number.
Trivia: 5215 is an uninteresting number.
Fecha histórica: April 11th is the day in 1987 that the London Agreement is secretly signed between Israeli Foreign Affairs Minister Shimon Peres and King Hussein of Jordan.