21982604 has 12 divisors (see below), whose sum is σ = 43965264. Its totient is φ = 9421104.

The previous prime is 21982603. The next prime is 21982621. The reversal of 21982604 is 40628912.

21982604 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21982603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 392519 + ... + 392574.

It is an arithmetic number, because the mean of its divisors is an integer number (3663772).

Almost surely, 2^21982604 is an apocalyptic number.

It is an amenable number.

21982604 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21982604 is a wasteful number, since it uses less digits than its factorization.

21982604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785104 (or 785102 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 21982604 is about 4688.5609732625. The cubic root of 21982604 is about 280.1300586267.

The spelling of 21982604 in words is "twenty-one million, nine hundred eighty-two thousand, six hundred four".