100,000,000,000,000,000,000 {a 1 with 20 zeros}, or 100 quintillion.
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That number in word form is: one hundred quintillion.
The result of multiplying 20,000,000,000 by 99,999,999,999,999,999,999 is 1,999,999,999,999,999,999,800,000,000,000.
The number that comes after 23099 is 23100.
The number that comes after 2 is 1.
The number that comes immediately after 90 is 91.