21233256 has 32 divisors (see below), whose sum is σ = 57909600. Its totient is φ = 6434240.

The previous prime is 21233243. The next prime is 21233263. The reversal of 21233256 is 65233212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39951 + ... + 40478.

It is an arithmetic number, because the mean of its divisors is an integer number (1809675).

Almost surely, 2^21233256 is an apocalyptic number.

It is an amenable number.

21233256 is an abundant number, since it is smaller than the sum of its proper divisors (36676344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21233256 is a wasteful number, since it uses less digits than its factorization.

21233256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80449 (or 80445 counting only the distinct ones).

The product of its digits is 2160, while the sum is 24.

The square root of 21233256 is about 4607.9557289540. The cubic root of 21233256 is about 276.9101438879.

Adding to 21233256 its reverse (65233212), we get a palindrome (86466468).

The spelling of 21233256 in words is "twenty-one million, two hundred thirty-three thousand, two hundred fifty-six".