22555521 has 24 divisors (see below), whose sum is σ = 33633600. Its totient is φ = 14557536.

The previous prime is 22555487. The next prime is 22555529. The reversal of 22555521 is 12555522.

It is not a de Polignac number, because 22555521 - 2⁶ = 22555457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22555529) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64455 + ... + 64803.

It is an arithmetic number, because the mean of its divisors is an integer number (1401400).

Almost surely, 2^22555521 is an apocalyptic number.

It is an amenable number.

22555521 is a deficient number, since it is larger than the sum of its proper divisors (11078079).

22555521 is a wasteful number, since it uses less digits than its factorization.

22555521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565 (or 562 counting only the distinct ones).

The product of its digits is 5000, while the sum is 27.

The square root of 22555521 is about 4749.2653116035. The cubic root of 22555521 is about 282.5428279757.

Subtracting from 22555521 its reverse (12555522), we obtain a palindrome (9999999).

It can be divided in two parts, 2255 and 5521, that added together give a 5-th power (7776 = 6⁵).

The spelling of 22555521 in words is "twenty-two million, five hundred fifty-five thousand, five hundred twenty-one".