Either 12 or 18. In English-speaking countries, a trillion is usually defined as a 1 followed by 12 zeroes.
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12 zeros in a trillion.
12
none.
100
None. You could write is as 1,000 kilowatt and have 3 0s or 1,000,000 watts (6 0s) or 1,000,000,000 milliwatts (9 0s) etc.