21976790 has 32 divisors (see below), whose sum is σ = 43385760. Its totient is φ = 7948800.

The previous prime is 21976783. The next prime is 21976813. The reversal of 21976790 is 9767912.

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 15 ways as a sum of consecutive naturals, for example, 26096 + ... + 26924.

It is an arithmetic number, because the mean of its divisors is an integer number (1355805).

Almost surely, 2^21976790 is an apocalyptic number.

21976790 is a deficient number, since it is larger than the sum of its proper divisors (21408970).

21976790 is a wasteful number, since it uses less digits than its factorization.

21976790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088.

The product of its (nonzero) digits is 47628, while the sum is 41.

The square root of 21976790 is about 4687.9409125969. The cubic root of 21976790 is about 280.1053600094.

The spelling of 21976790 in words is "twenty-one million, nine hundred seventy-six thousand, seven hundred ninety".