In the US system, one trillion has 12 zeros.
1,000,000,000,000.
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What is a big number and what is not depends on the context. A trillion blood cells is a small number, a trillion living organisms on a planet is a small number. On the other hand, a trillion mammals on a planet is a large number.
The measurement unit also makes a difference: I prefer to walk a trillion nanometres rather than wait for a bus. And I am more than 2 trillion milliseconds old.
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1,000
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It wouldn't exist as the gravitational attraction would tear the
planet apart.