21120232 has 16 divisors (see below), whose sum is σ = 45257760. Its totient is φ = 9051504.

The previous prime is 21120223. The next prime is 21120251. The reversal of 21120232 is 23202112.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188518 + ... + 188629.

It is an arithmetic number, because the mean of its divisors is an integer number (2828610).

Almost surely, 2^21120232 is an apocalyptic number.

It is an amenable number.

21120232 is an abundant number, since it is smaller than the sum of its proper divisors (24137528).

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

21120232 is a wasteful number, since it uses less digits than its factorization.

21120232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377160 (or 377156 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21120232 is about 4595.6753584212. The cubic root of 21120232 is about 276.4179413294.

Adding to 21120232 its reverse (23202112), we get a palindrome (44322344).

The spelling of 21120232 in words is "twenty-one million, one hundred twenty thousand, two hundred thirty-two".