22521955 has 4 divisors (see below), whose sum is σ = 27026352. Its totient is φ = 18017560.

The previous prime is 22521931. The next prime is 22521971. The reversal of 22521955 is 55912522.

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

It is not a de Polignac number, because 22521955 - 2¹¹ = 22519907 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2252191 + ... + 2252200.

It is an arithmetic number, because the mean of its divisors is an integer number (6756588).

Almost surely, 2^22521955 is an apocalyptic number.

22521955 is a deficient number, since it is larger than the sum of its proper divisors (4504397).

22521955 is an equidigital number, since it uses as much as digits as its factorization.

22521955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4504396.

The product of its digits is 9000, while the sum is 31.

The square root of 22521955 is about 4745.7301861779. The cubic root of 22521955 is about 282.4026030183.

The spelling of 22521955 in words is "twenty-two million, five hundred twenty-one thousand, nine hundred fifty-five".