Hecho general: 1237 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 1237 is the smallest prime that contains exactly 5 smaller primes as substrings.
Trivia: 1237 is an unremarkable number.
Fecha histórica: May 21st is the day in 1996 that the Trappist Martyrs of Atlas, kidnapped during the Algerian Civil War and held for two months, are found dead.