The number "one hundred one" thousandths is 0.101
The distinction must be made between "one hundred one" thousandths and "one hundred" one-thousandths (which is why it is seldom used, and needs a hyphen if is used). In any event 100/1000 is not in simplest form, but might be used in some rare cases.
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Expressed as a number, this is equal to 2000.0001. Unless you are referring to the fraction 2010/100000, which is written as a decimal 0.0201.
You write the number two hundred three ten-thousandths written in standard form as: 2.03 × 10-2