22522721 has 16 divisors (see below), whose sum is σ = 25041744. Its totient is φ = 20127744.

The previous prime is 22522693. The next prime is 22522757. The reversal of 22522721 is 12722522.

It can be written as a sum of positive squares in 8 ways, for example, as 1132096 + 21390625 = 1064^2 + 4625^2 .

It is a de Polignac number, because none of the positive numbers 2^k-22522721 is a prime.

It is a super-2 number, since 2×22522721² = 1014545922487682, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22522021) 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, 66665 + ... + 67001.

It is an arithmetic number, because the mean of its divisors is an integer number (1565109).

Almost surely, 2^22522721 is an apocalyptic number.

It is an amenable number.

22522721 is a deficient number, since it is larger than the sum of its proper divisors (2519023).

22522721 is a wasteful number, since it uses less digits than its factorization.

22522721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500.

The product of its digits is 1120, while the sum is 23.

The square root of 22522721 is about 4745.8108896162. The cubic root of 22522721 is about 282.4058046045.

The spelling of 22522721 in words is "twenty-two million, five hundred twenty-two thousand, seven hundred twenty-one".