21996982 has 24 divisors (see below), whose sum is σ = 38614536. Its totient is φ = 9370368.

The previous prime is 21996979. The next prime is 21996983. The reversal of 21996982 is 28969912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21996983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18333 + ... + 19495.

It is an arithmetic number, because the mean of its divisors is an integer number (1608939).

Almost surely, 2^21996982 is an apocalyptic number.

21996982 is a deficient number, since it is larger than the sum of its proper divisors (16617554).

21996982 is a wasteful number, since it uses less digits than its factorization.

21996982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372 (or 1365 counting only the distinct ones).

The product of its digits is 139968, while the sum is 46.

The square root of 21996982 is about 4690.0940289082. The cubic root of 21996982 is about 280.1911195179.

The spelling of 21996982 in words is "twenty-one million, nine hundred ninety-six thousand, nine hundred eighty-two".