21258204 has 24 divisors (see below), whose sum is σ = 54112128. Its totient is φ = 6441840.

The previous prime is 21258199. The next prime is 21258253. The reversal of 21258204 is 40285212.

It is a super-2 number, since 2×21258204² = 903822474611232, which contains 22 as substring.

It is a congruent number.

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, 80392 + ... + 80655.

It is an arithmetic number, because the mean of its divisors is an integer number (2254672).

Almost surely, 2^21258204 is an apocalyptic number.

It is an amenable number.

21258204 is an abundant number, since it is smaller than the sum of its proper divisors (32853924).

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

21258204 is a wasteful number, since it uses less digits than its factorization.

21258204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161065 (or 161063 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 21258204 is about 4610.6619915149. The cubic root of 21258204 is about 277.0185532369.

The spelling of 21258204 in words is "twenty-one million, two hundred fifty-eight thousand, two hundred four".