The number after 999,999,999,999,999,999 is 1,000,000,000,000,000,000.
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One quintillion.
A henagon has one sides, and a cirle has over 999999999999999999 sides so yeah.
23 Prime numbers are odd numbers and 21=3x7
17
1 000 000 000 000 000 000 (One quintillion, U.S. and scientific. One trillion, Britain and other countries.)