13
The highest number a quarterback can wear in the NFL is 19, which was worn by Johnny Unitas, who played for the Baltimore Colts.-----The highest jersey number that I can remember was #60 worn by Otto Graham of the Cleveland Browns of the All-American Football Conference. John Hadl of the Chargers and Rams wore #21 during his career in the 60s and 70s. But since the merger in 1970, the highest number a quarterback on the roster can wear is 19.
joe Montana
The best known currently starting NFL quarterback is Ben Roethlisberger of the Pittsburgh Steelers.
drew brees
Johnny unitas.
Jim Kelly
terry bradshaw
Tom Brady
An NFL quarterback.
Michael Vick
joe Montana