There are several, of which endeca- and hendeca- are more common. However, most mathematicians who wish to communicate rather than be pretentious will refer to an 11-gon or 11-hedron rather than use the prefices.
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Mega- (M) is an SI prefix in the SI system of units denoting a factor of 10^6, 1,000,000 (one million)
Eleven and eleven thousandths.
It is 11,12,111
eleven thousand eleven hundred and eleven rupees is written as : Rs. 11,111.
11,011 is how you write eleven thousand eleven