The notation "4e 21" on a calculator represents the number ( 4 \times 10^{21} ). The "e" stands for exponent, indicating that the number 4 should be multiplied by 10 raised to the power of 21. This is a shorthand way of expressing very large numbers in scientific notation. Thus, it equals 4 followed by 21 zeros.
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It means that the time it took you to post this question, you could have typed it into a calculator. D'oh!
use the calculator it's 105
966 Btw your computer has a calculator its under accesories
0.2039
try using a calculator? but anyway its 21 when rounded