第 (ordinal marker) + number = "the Nth." 第二十二 follows the standard 第 + 二十二 (22) construction. The classic literary reference is 第二十二条军规 - the Chinese title of Joseph Heller's novel Catch-22.
Joseph Heller's 1961 satirical novel about WWII pilots trapped by paradoxical military bureaucracy. The Chinese title literally means "Military Regulation No. 22."
