If you mean the American trillion - a 1, followed by 12 zeroes - the prefix is tera.
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milli --
The prefix for million is mega-.
The metric system prefix for the quantity 0.000 001 is micro-, denoted as μ. This represents one millionth of the base unit.
In the metric system, "centi" is a prefix: it is not a measurement unit of any kind.
Centi is the metric prefix for one hundredth. It is abbreviated as "c" in the International System of Units (SI).