Roberto Clemente wore uniform number 13, and 21 during his first year in 1955 with the Pittsburgh Pirates, and wore uniform number 21 the rest of his career from 1956 -1972.
Steelers starting quarterback Ben Roethlisberger wears #7.
Robert Golden is number 21 on the Pittsburgh Steelers.
He wore #21.
Rafael wore jersey number 21 for mancunian republic in 2010-2011.
Borje Salming wore number 21 for the Toronto Mapleleafs. However, he left the team in 1989 and his number 21 was taken by a future NHL star named Sean McKenna.
He wore #21.
No Steelers player wore #6 in Super Bowl XIII, which was played on January 21, 1979. The #6 was worn by Jim Elliott in 1967 and then again by Bubby Brister from 1986-1992.
According to Baseball Almanac, no one on the 1995 White Sox roster wore #21.
In 1980, running back Clark Gaines wore #21 for the New York Jets.
70 goals in his career. The most goals he scored in a season was 21 in 2010-2011
Pac Man Jones wore # 21 in 2008.