icosikaidi is the name for a 22 sided polygon. For a list of the names for polygons, see the related link.
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The name of a 10 sided polygon is Decagon.
I would just call it a 500-sided polygon.
The name of a 14 sided polygon is Tetradecagon.
Octacontakaioctagon.
I'd recommend "decatrillogon" for ten trillion sides.