Coming Out !!hot!!: When Is 2.21

If you mean — that was released in 2010.

If you meant — Blender 2.2x series is very old (early 2000s), and 2.21 would have been released around 2001–2002 if it existed. when is 2.21 coming out

If you mean — Linux kernel versions jumped from 2.6.x to 3.x, so 2.21 was never released. If you mean — that was released in 2010