21965272 has 32 divisors (see below), whose sum is σ = 48345120. Its totient is φ = 9158400.

The previous prime is 21965249. The next prime is 21965351. The reversal of 21965272 is 27256912.

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 7 ways as a sum of consecutive naturals, for example, 3229 + ... + 7372.

It is an arithmetic number, because the mean of its divisors is an integer number (1510785).

Almost surely, 2^21965272 is an apocalyptic number.

It is an amenable number.

21965272 is an abundant number, since it is smaller than the sum of its proper divisors (26379848).

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

21965272 is a wasteful number, since it uses less digits than its factorization.

21965272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10651 (or 10647 counting only the distinct ones).

The product of its digits is 15120, while the sum is 34.

The square root of 21965272 is about 4686.7122804798. The cubic root of 21965272 is about 280.0564172032.

The spelling of 21965272 in words is "twenty-one million, nine hundred sixty-five thousand, two hundred seventy-two".