22521265 has 16 divisors (see below), whose sum is σ = 29222928. Its totient is φ = 16563456.

The previous prime is 22521263. The next prime is 22521281. The reversal of 22521265 is 56212522.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 954529 + 21566736 = 977^2 + 4644^2 .

It is not a de Polignac number, because 22521265 - 2¹ = 22521263 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22521263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20059 + ... + 21151.

It is an arithmetic number, because the mean of its divisors is an integer number (1826433).

Almost surely, 2^22521265 is an apocalyptic number.

It is an amenable number.

22521265 is a deficient number, since it is larger than the sum of its proper divisors (6701663).

22521265 is a wasteful number, since it uses less digits than its factorization.

22521265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1428.

The product of its digits is 2400, while the sum is 25.

The square root of 22521265 is about 4745.6574886943. The cubic root of 22521265 is about 282.3997190208.

Adding to 22521265 its reverse (56212522), we get a palindrome (78733787).

The spelling of 22521265 in words is "twenty-two million, five hundred twenty-one thousand, two hundred sixty-five".