21902964 has 24 divisors (see below), whose sum is σ = 52489248. Its totient is φ = 7103520.

The previous prime is 21902963. The next prime is 21902971. The reversal of 21902964 is 46920912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21902963) by changing a digit.

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, 24222 + ... + 25109.

It is an arithmetic number, because the mean of its divisors is an integer number (2187052).

Almost surely, 2^21902964 is an apocalyptic number.

It is an amenable number.

21902964 is an abundant number, since it is smaller than the sum of its proper divisors (30586284).

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

21902964 is a wasteful number, since it uses less digits than its factorization.

21902964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49375 (or 49373 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 21902964 is about 4680.0602560224. The cubic root of 21902964 is about 279.7913581747.

The spelling of 21902964 in words is "twenty-one million, nine hundred two thousand, nine hundred sixty-four".