I came up with 1009 because I did it with paper I'm not sure but, try it.
42,170
1820
Nine million, nine hundred thousand
90%
9,900 (nine thousand nine hundred)
um, one hundred and ninety nine thousand, nine hundred and ninety nine.
Nine million, eight hundred nine thousand, eight hundred twenty one.It is nine million eight hundred nine thousand eight hundred twenty one.
One Hundred Thirty Thousand, Nine Hundred Eleven.
one hundred thousand seven hundred forty nine
thirty one thousand twenty nine hundred. twenty nine hundred is equal to two thousand nine hundred so 31 thousand+ 2900 =33900
nine hundred thirty seven thousand one hundred one = 937,101
One hundred-thousand, minus one hundred equals ninety-nine thousand nine-hundred (99,900).