21258032 has 20 divisors (see below), whose sum is σ = 41306880. Its totient is φ = 10598208.

The previous prime is 21258023. The next prime is 21258059. The reversal of 21258032 is 23085212.

It is a junction number, because it is equal to n+sod(n) for n = 21257989 and 21258007.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4394 + ... + 7862.

It is an arithmetic number, because the mean of its divisors is an integer number (2065344).

Almost surely, 2^21258032 is an apocalyptic number.

It is an amenable number.

21258032 is a deficient number, since it is larger than the sum of its proper divisors (20048848).

21258032 is a wasteful number, since it uses less digits than its factorization.

21258032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3860 (or 3854 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 21258032 is about 4610.6433390580. The cubic root of 21258032 is about 277.0178061164.

The spelling of 21258032 in words is "twenty-one million, two hundred fifty-eight thousand, thirty-two".