Hecho general: 2421 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 2421 is a boring number.
Trivia: 2421 is an uninteresting number.
Fecha histórica: August 17th is the day in 1907 that Pike Place Market, a popular tourist destination and registered historic district in Seattle, opened.