In the US and many other countries, using the "short scale," there are 12. The number is 4,000,000,000,000 (4 x 1012).
In some non-English-speaking countries (and rarely in the UK) the long scale is used, where the number of zeros is 18. On the long scale, a trillion is a million million million.
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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.
11 zeros
10 zeros
A trillion has 12 zeros