22 (twenty-two) is the natural number following 21 and preceding 23. In a 24-hour clock, the twenty-second hour is in conventional language called ten or ten o'clock.

22 is deficient

When cutting a circle with just six line segments, the maximum number of pieces that can be so created is 22, thus 22 is a central polygonal number (see lazy caterer's sequence).

Twenty-two may also refer to:

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