21976793 has 4 divisors (see below), whose sum is σ = 22071348. Its totient is φ = 21882240.

The previous prime is 21976783. The next prime is 21976813. The reversal of 21976793 is 39767912.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13520329 + 8456464 = 3677^2 + 2908^2 .

It is a cyclic number.

It is not a de Polignac number, because 21976793 - 2¹⁶ = 21911257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21976763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46928 + ... + 47393.

It is an arithmetic number, because the mean of its divisors is an integer number (5517837).

Almost surely, 2^21976793 is an apocalyptic number.

It is an amenable number.

21976793 is a deficient number, since it is larger than the sum of its proper divisors (94555).

21976793 is an equidigital number, since it uses as much as digits as its factorization.

21976793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94554.

The product of its digits is 142884, while the sum is 44.

The square root of 21976793 is about 4687.9412325668. The cubic root of 21976793 is about 280.1053727549.

The spelling of 21976793 in words is "twenty-one million, nine hundred seventy-six thousand, seven hundred ninety-three".