Above a certain number of sides, a polygon is simply called an n-gon, with the letter "n" representing the number of sides. So, in your case, a 22-gon.
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A polygon that has 209 diagonals will have 22 sides and it's perfectly acceptable to call it a 22-agon.
A polygon with 6 sides is called a hexagon.
A polygon is a closed figure bounded by sides only. Triangle is the polygon of 3 sides and 3 vertices.
22 sides
HexagoN