Hecho general: 5226 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 5226 is the number of ways to color the vertices of a square with 12 colors, up to rotation.
Trivia: 5226 is a boring number.
Fecha histórica: April 22nd is the day in 1912 that Pravda, the "voice" of the Communist Party of the Soviet Union, begins publication in Saint Petersburg.