According to various other websites, a twenty-two sided shape is known as an icosikaidigon. :)
When you type it on a computer, it may have a red line underneath it but that is how you spell it. I don't know why it's not there. I mean nonagon isn't there either!
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A 2d nine sided shape is called a nonagon.
A 14 sided polygon is called a tetrakaidecagon.
Hendecagon
Hexakaidecagon
Decagon