Coming off of their bye week, the Texans faced the Cleveland Browns on the road in Ryan Mallet's first career start. Mallet passed for his first career touchdown to J. J. Watt to give the Texans an early 7-0 lead. Cleveland scored in the 2nd quarter to tie the game 7-7, which would be their only score of the entire game. Houston scored the last touchdown of the game after Mallet connected with Garrett Graham to lead 14-7 going into halftime. The Texans' defense completely shutout the Browns during the second half, while Houston's only scores came from 3 Randy Bullock field goals. Following the win, the Texans went to 5-5 and started 1-0 under Mallet.

Answer this question based on the article: How many total points were scored by halftime?
21