1.9 x 109
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It is: 2.1*10^19 in scientific notation
100 billion times 200 billion equals 20,000,000,000,000,000,000, or 20 quintillion. You can also express this as 2 x 10^19 in scientific notation.
Such a large number would be expressed in scientific notation in the form of 1.5*10^19
19 trillion can be written in scientific notation as 1.9 x 10^13.
1.9 x 10^13