21982072 has 32 divisors (see below), whose sum is σ = 47397600. Its totient is φ = 9362304.

The previous prime is 21982067. The next prime is 21982091. The reversal of 21982072 is 27028912.

It is a super-2 number, since 2×21982072² = 966422978826368, which contains 22 as substring.

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, 8554 + ... + 10822.

It is an arithmetic number, because the mean of its divisors is an integer number (1481175).

Almost surely, 2^21982072 is an apocalyptic number.

It is an amenable number.

21982072 is an abundant number, since it is smaller than the sum of its proper divisors (25415528).

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

21982072 is a wasteful number, since it uses less digits than its factorization.

21982072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2455 (or 2451 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 21982072 is about 4688.5042390937. The cubic root of 21982072 is about 280.1277988035.

The spelling of 21982072 in words is "twenty-one million, nine hundred eighty-two thousand, seventy-two".