21976799 has 16 divisors (see below), whose sum is σ = 25503744. Its totient is φ = 18770400.

The previous prime is 21976783. The next prime is 21976813. The reversal of 21976799 is 99767912.

It is a cyclic number.

It is not a de Polignac number, because 21976799 - 2⁴ = 21976783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21976399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8084 + ... + 10454.

It is an arithmetic number, because the mean of its divisors is an integer number (1593984).

Almost surely, 2^21976799 is an apocalyptic number.

21976799 is a deficient number, since it is larger than the sum of its proper divisors (3526945).

21976799 is a wasteful number, since it uses less digits than its factorization.

21976799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2438.

The product of its digits is 428652, while the sum is 50.

The square root of 21976799 is about 4687.9418725065. The cubic root of 21976799 is about 280.1053982459.

The spelling of 21976799 in words is "twenty-one million, nine hundred seventy-six thousand, seven hundred ninety-nine".