Eight zeros.
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21
There are 9 zeros in one billion
A billion is 1 followed by nine zeros 70 billion thus has 10 zeros 70,000,000,000
Seven 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.