General fact: 51207 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 51207 is an uninteresting number.
Trivia: 51207 is a boring number.
Historical date: March 13th is the day in 1845 that Felix Mendelssohn's Violin Concerto receives its première performance in Leipzig with Ferdinand David as soloist.