As we've detailed separately, "What Do You Mean?" has already earned Bieber an impressive list of chart accolades. It makes him the youngest male to debut at No. 1 on the Hot 100 (he's 21; previously record holder was Baauer at age 23); It's just the 23rd song in the Hot 100's 57-year history to debut at No. 1; and perhaps most important for his future, it's his first co-producing and co-writing credit on a No. 1 hit.