2.0 x 1021 we can use scientific notation to solve this. It's going to be a long number.
The answer is: 2,000,000,000,000,000,000,000.
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It is: 200
the answer is 300
16(2^n)(10)(2^n)=160[2^(2n)]=160(4^n)
2^21=2,097,152
(10)3 x (2)2 = 1,000 x 4 = 4,000