21976974 has 16 divisors (see below), whose sum is σ = 48837840. Its totient is φ = 7325640.

The previous prime is 21976967. The next prime is 21976979. The reversal of 21976974 is 47967912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21976979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203437 + ... + 203544.

It is an arithmetic number, because the mean of its divisors is an integer number (3052365).

Almost surely, 2^21976974 is an apocalyptic number.

21976974 is an abundant number, since it is smaller than the sum of its proper divisors (26860866).

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

21976974 is a wasteful number, since it uses less digits than its factorization.

21976974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406992 (or 406986 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The square root of 21976974 is about 4687.9605373766. The cubic root of 21976974 is about 280.1061417318.

The spelling of 21976974 in words is "twenty-one million, nine hundred seventy-six thousand, nine hundred seventy-four".