21433232 has 10 divisors (see below), whose sum is σ = 41526918. Its totient is φ = 10716608.

The previous prime is 21433231. The next prime is 21433259. The reversal of 21433232 is 23233412.

It can be written as a sum of positive squares in only one way, i.e., 11723776 + 9709456 = 3424^2 + 3116^2 .

It is not an unprimeable number, because it can be changed into a prime (21433231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669773 + ... + 669804.

Almost surely, 2^21433232 is an apocalyptic number.

It is an amenable number.

21433232 is a deficient number, since it is larger than the sum of its proper divisors (20093686).

21433232 is a wasteful number, since it uses less digits than its factorization.

21433232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339585 (or 1339579 counting only the distinct ones).

The product of its digits is 864, while the sum is 20.

The square root of 21433232 is about 4629.6038707432. The cubic root of 21433232 is about 277.7767474214.

Adding to 21433232 its reverse (23233412), we get a palindrome (44666644).

The spelling of 21433232 in words is "twenty-one million, four hundred thirty-three thousand, two hundred thirty-two".