One trillion
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1 with 12 zeros behind it OR 1 Trillion
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.
A trillion has 12 zeros
2,000,000,000,000=12 zero's2,000,000,000,000so 12 zeros
There are 12 zeros. 1000000000000