The Browns then returned for a game against their division rival Bengals in Game 1 of the Battle of Ohio.  After a scoreless first quarter, the Bengals offense exploded in the second quarter with 3 touchdowns:  Dalton threw all 3 when he found A.J. Green on a 7-yard pass, Tyler Kroft on a 3-yard pass, and Giovani Bernard on a 61-yard pass to make the score 7-0, 14-0, and 21-0 at halftime.  In the third quarter, the Bengals increased their lead when Randy Bullock kicked a 41-yard field goal to make it 24-0.  This would be followed by Dalton's 4th touchdown pass of the game:  Another one to Kroft from 16 yards out to make it 31-0.  The Browns scored their only points of the game in the fourth quarter when Duke Johnson Jr. ran for a 1-yard touchdown to make the final score 31-7.  The Browns lost their 14th straight divisional game as they fell to 0-4 and had sole possession of last place in the AFC North.
Question: How many points did the Bengals score in the first half?
Answer: 21