A sextillion which has a total of 21 zeros.
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One quintillion one, or to some persons one quintillion and one.
The answer is quintillion. Before quintillion in quadrillion then trillion. After quintillion is sextillion then septillion and so on.
1,000,000,000,000,000,000=1 quintillion
Since a quintillion has 18 zeros; one quintillion would look like this: 1,000,000,000,000,000,000
Hundred quintillion one.