It is written as two words if used as a noun: "he entered the house through the back door." It is written as one if used as an adjective: "the Basketball team ran a backdoor play that produced an easy layup."
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Nine million one hundred twenty-three thousand seventy-two.
2.105 is written as: two and one hundred five thousandths.
One word, two syllables
Literally, "Zero point six nine two." As a fraction, "Six hundred ninety-two one-thousandths."
The word form is: two hundred octovigintillion.