In countries that use the "short scale" for naming integer multiples of ten, there are 12 zeros in a trillion. In countries that use the "long scale" there are 18 zeros in a trillion.
The long scale is used in much of continental Europe and Latin America. The short scale is use by most English-speaking and Arabic-speaking countries.
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There are 12 zeros in 3 trillion.
There are 15 zeros in the number 6,000,000,000,000,000 (6 trillion). ---- Actually, this is six trillion -> 6,000,000,000,000 so there are actually 12 zeros in 6 trillion.
10 zeros
11 zeros
A trillion has 12 zeros