18 zeros
1 million = 6 zeros
1 billion = 9
1 trillion = 12
1 quadrillion = 15
1 quintillion = 18
1 sextillion =21
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One quintillion.
A quintillion is 1018 That's a one with eighteen zeros.
Quintillion has eighteen (18) zeros.1,000,000,000,000,000,000.Eighteen (18) zeros(0), one (1) one(1)...nineteen places.
Since a quintillion has 18 zeros; one quintillion would look like this: 1,000,000,000,000,000,000
A sextillion which has a total of 21 zeros.