vingt et un
29,000,000,000,023 is read as twenty-nine-trillion- twenty-three.
You should write it as twenty nine thousand dollars, assuming that is what you meant.
nine and twenty-nine thousandths.
Being English I write it as: one hundred and twenty, and nine hundredths; or one hundred and twenty point zero nine. Americans are likely to write it: one hundred twenty and nine hundredths
Three and twenty-nine ten-thousandths.
vingt-neuf
2900
twenty-nine
9.20
0.29
29
29,000,000,000