1,000,000,000,000,000,000 = 1018 = Quintillion
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1 quintillion is equal to 1 followed by 18 zeros. When you multiply 1 quintillion by 1 quintillion, you are essentially multiplying 1 with 18 zeros by 1 with another 18 zeros. This results in a number with 36 zeros, which is equal to 1 followed by 36 zeros. This number is known as a sextillion.
It is at least a quintillion. It could be a larger number such are 123,456,789,000,000,000,000,000,000.
There are 18 zeros.
It has 21 zeros, because 'Giga' means 'a Billion'. Thus, one GigaTrillion is 1 Billion-Trillion. A billion has 9 zeros, and a trillion has 12 zeros. However, if you are referring to the United Kingdom, a billion has 12 zeros and a trillion has 18 zeros, so it would be 30 zeros.
There isn't a quiltrillion but there is a quintrillion which has 18 zeros. A quadtrillion has 15 zeros.