Trying to snap a two-game skid, the Broncos went home for a Week 14 AFC West rematch with the Kansas City Chiefs.  In the first quarter, Denver drew first blood as QB Jay Cutler completed a 21-yard TD pass to WR Brandon Stokley, while RB Travis Henry got a 1-yard TD run.  In the second quarter, the Chiefs would get their only score of the game with QB Brodie Croyle completing a 15-yard TD pass to TE Tony Gonzalez.  Afterwards, the Broncos took over as Cutler completed an 8-yard TD pass to WR Brandon Marshall, while kicker Jason Elam managed to get a 37-yard field goal.  In the third quarter, Denver pulled away as Elam nailed another 37-yard field goal, while Cutler completed a 2-yard TD pass to TE Daniel Graham, along with a 13-yard TD pass to Marshall. Also with this win, it improved Denver's divisional home record since 2001 to 18-4.
Question: How many yards was the longest touchdown pass?
Answer: 21