If a number is in the range 21 to 99, and the second digit is not zero, one typically writes the number as two words separated by a hyphen.
In American usage, four-digit numbers with non-zero hundreds are often named using multiples of "hundred" and combined with tens and ones: "One thousand one", "Eleven hundred three", "Twelve hundred twenty-five", "Four thousand forty-two", or "Ninety-nine hundred ninety-nine."