It is 1.000021 if you mean 1 and 21 millionths
or 1.000020 if you mean 1 and 20 one-millionths.
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Twenty one millionths in standard form is written as 0.000021. This is because each place value after the decimal point represents a power of 10 that is negative. In this case, the digit 2 is in the hundred thousandths place, the digit 1 is in the millionths place, and the rest are zeros.
0.00002
0.000020
.000005
Expressed as a decimal, nineteen millionths is equal to 0.000019.