21358968 has 16 divisors (see below), whose sum is σ = 53397480. Its totient is φ = 7119648.

The previous prime is 21358951. The next prime is 21358979. The reversal of 21358968 is 86985312.

It is a congruent number.

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, 444955 + ... + 445002.

Almost surely, 2^21358968 is an apocalyptic number.

It is an amenable number.

21358968 is an abundant number, since it is smaller than the sum of its proper divisors (32038512).

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

21358968 is a wasteful number, since it uses less digits than its factorization.

21358968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889966 (or 889962 counting only the distinct ones).

The product of its digits is 103680, while the sum is 42.

The square root of 21358968 is about 4621.5763544488. The cubic root of 21358968 is about 277.4555533067.

The spelling of 21358968 in words is "twenty-one million, three hundred fifty-eight thousand, nine hundred sixty-eight".