None, since there is no such shape as a hendagon. You may wish to check and correct your spelling and resubmit the question.
11 Sides
the prefix of hendagon is henda(i am guessing)
If you wish to communicate information, I suggest you call it an 10^33-gon or possibly a decillion-gon. Although there is probably a prefix for the number I suggest you keep it simple. Not only is the use of long and unfamiliar Greek prefices pretentious, you will only annoy the reader who will probably have to consult a dictionary.