21230972 has 24 divisors (see below), whose sum is σ = 42905184. Its totient is φ = 9004032.

The previous prime is 21230969. The next prime is 21231029. The reversal of 21230972 is 27903212.

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, 1193 + ... + 6624.

It is an arithmetic number, because the mean of its divisors is an integer number (1787716).

Almost surely, 2^21230972 is an apocalyptic number.

It is an amenable number.

21230972 is an abundant number, since it is smaller than the sum of its proper divisors (21674212).

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

21230972 is a wasteful number, since it uses less digits than its factorization.

21230972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7925 (or 7923 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 21230972 is about 4607.7078900469. The cubic root of 21230972 is about 276.9002147239.

The spelling of 21230972 in words is "twenty-one million, two hundred thirty thousand, nine hundred seventy-two".