22481921 has 32 divisors (see below), whose sum is σ = 29982720. Its totient is φ = 16465680.

The previous prime is 22481909. The next prime is 22481923. The reversal of 22481921 is 12918422.

It is not a de Polignac number, because 22481921 - 2¹⁰ = 22480897 is a prime.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22481923) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 176960 + ... + 177086.

It is an arithmetic number, because the mean of its divisors is an integer number (936960).

Almost surely, 2^22481921 is an apocalyptic number.

It is an amenable number.

22481921 is a deficient number, since it is larger than the sum of its proper divisors (7500799).

22481921 is a wasteful number, since it uses less digits than its factorization.

22481921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186 (or 164 counting only the distinct ones).

The product of its digits is 2304, while the sum is 29.

The square root of 22481921 is about 4741.5104133599. The cubic root of 22481921 is about 282.2351751127.

The spelling of 22481921 in words is "twenty-two million, four hundred eighty-one thousand, nine hundred twenty-one".