What is a 21 sided polygon called?

Answer 1

henicosagon

Answer 2

Oh, dude, a 21-sided polygon is called a icosikaihenagon. Yeah, I know, it sounds like something you'd make up after a few too many drinks at a math convention. But hey, that's the beauty of geometry - it's like a party where all the shapes get together and have a good time.

Answer 3

21 sided polygon: icosikaihenagon or henicosagon