22531621 has 6 divisors (see below), whose sum is σ = 26210310. Its totient is φ = 19312776.

The previous prime is 22531609. The next prime is 22531627. The reversal of 22531621 is 12613522.

It can be written as a sum of positive squares in only one way, i.e., 13764100 + 8767521 = 3710^2 + 2961^2 .

It is not a de Polignac number, because 22531621 - 2⁵ = 22531589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22531592 and 22531601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22531627) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 229866 + ... + 229963.

It is an arithmetic number, because the mean of its divisors is an integer number (4368385).

Almost surely, 2^22531621 is an apocalyptic number.

It is an amenable number.

22531621 is a deficient number, since it is larger than the sum of its proper divisors (3678689).

22531621 is an equidigital number, since it uses as much as digits as its factorization.

22531621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459843 (or 459836 counting only the distinct ones).

The product of its digits is 720, while the sum is 22.

The square root of 22531621 is about 4746.7484660555. The cubic root of 22531621 is about 282.4429978707.

The spelling of 22531621 in words is "twenty-two million, five hundred thirty-one thousand, six hundred twenty-one".