21233224 has 16 divisors (see below), whose sum is σ = 39869100. Its totient is φ = 10601472.

The previous prime is 21233213. The next prime is 21233239. The reversal of 21233224 is 42233212.

It can be written as a sum of positive squares in 2 ways, for example, as 20088324 + 1144900 = 4482^2 + 1070^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6004 + ... + 8860.

Almost surely, 2^21233224 is an apocalyptic number.

It is an amenable number.

21233224 is a deficient number, since it is larger than the sum of its proper divisors (18635876).

21233224 is a wasteful number, since it uses less digits than its factorization.

21233224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3792 (or 3788 counting only the distinct ones).

The product of its digits is 576, while the sum is 19.

The square root of 21233224 is about 4607.9522566971. The cubic root of 21233224 is about 276.9100047802.

Adding to 21233224 its reverse (42233212), we get a palindrome (63466436).

The spelling of 21233224 in words is "twenty-one million, two hundred thirty-three thousand, two hundred twenty-four".