22920821 has 16 divisors (see below), whose sum is σ = 30082560. Its totient is φ = 16919280.

The previous prime is 22920803. The next prime is 22920829. The reversal of 22920821 is 12802922.

It is not a de Polignac number, because 22920821 - 2¹⁴ = 22904437 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 (22920829) 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, 6371 + ... + 9296.

It is an arithmetic number, because the mean of its divisors is an integer number (1880160).

Almost surely, 2^22920821 is an apocalyptic number.

It is an amenable number.

22920821 is a deficient number, since it is larger than the sum of its proper divisors (7161739).

22920821 is a wasteful number, since it uses less digits than its factorization.

22920821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15704.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 22920821 is about 4787.5694250841. The cubic root of 22920821 is about 284.0599828669.

The spelling of 22920821 in words is "twenty-two million, nine hundred twenty thousand, eight hundred twenty-one".