21

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21 is the 21st number in the Western Arabic numeral system.

Controversy

21's mathematical stability was temporarily undermined by Habib's older brother. On June 22nd, 2013, he told Habib he "was stupid," and asked Habib what 9 + 10 equaled. Habib answered "21" which his brother assumed was incorrect. This caused a short-lived divide in the mathematics community about the true answer of 9 + 10. However, on July 13th, 2013, it was ultimately ruled that the correct answer was indeed 21. Following the controversy, Habib's brother would post a video claiming Habib had died, which was shortly disproven.