21982704 has 40 divisors (see below), whose sum is σ = 57866832. Its totient is φ = 7188480.

The previous prime is 21982691. The next prime is 21982721. The reversal of 21982704 is 40728912.

It is a happy number.

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, 1777 + ... + 6864.

Almost surely, 2^21982704 is an apocalyptic number.

21982704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21982704 is an abundant number, since it is smaller than the sum of its proper divisors (35884128).

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

21982704 is a wasteful number, since it uses less digits than its factorization.

21982704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8705 (or 8699 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 21982704 is about 4688.5716375033. The cubic root of 21982704 is about 280.1304834014.

The spelling of 21982704 in words is "twenty-one million, nine hundred eighty-two thousand, seven hundred four".