If you want all the numbers added, it's 13212. If not, then it is impossible to write or type twelve thousand twelve hundred twelve in simplest form.
Twenty and one hundred twelve thousandths.
Four hundred twenty-four thousand, six hundred twelve.
twelve billion, three hundred twenty million, one hundred twenty thousand.
12/20 = 3/5
three billion, nine hundred twenty-five million, twelve thousand, three hundred twenty-nine and twenty-four hundredths.
Twelve and twenty-five hundredths.
21 percent or twenty-one out of one hundred is already in simplest form. Twenty-one and one hundred have no common factors (excepting 1).
twelve point four hundred twenty five