The formal name is hectaicosikaihenagon. Most people, including mathematicians, will use 121-gon since that effectively communicates the size of the polygon. But, if you want to appear pretentious or be obfuscatory, by all means use the Greek prefices.
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A 121-sided shape is a polygon if it is a plane figure and a polyhedron if it is a solid (3-dimensional) figure.
it is called a seven sided shape in Canada
A 90 sided shape is called Enneacontagon.
A 128-sided shape is called a hecatoicosioctagon.
An five sided shape is called a Pentagon
A 1000 sided shape is called a Chiliagon.