22644621 has 24 divisors (see below), whose sum is σ = 34496280. Its totient is φ = 14292096.

The previous prime is 22644619. The next prime is 22644623. The reversal of 22644621 is 12644622.

It is an interprime number because it is at equal distance from previous prime (22644619) and next prime (22644623).

It can be written as a sum of positive squares in 4 ways, for example, as 1022121 + 21622500 = 1011^2 + 4650^2 .

It is not a de Polignac number, because 22644621 - 2¹ = 22644619 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22644623) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 13015 + ... + 14651.

It is an arithmetic number, because the mean of its divisors is an integer number (1437345).

Almost surely, 2^22644621 is an apocalyptic number.

It is an amenable number.

22644621 is a deficient number, since it is larger than the sum of its proper divisors (11851659).

22644621 is a wasteful number, since it uses less digits than its factorization.

22644621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725 (or 1722 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 22644621 is about 4758.6364643667. The cubic root of 22644621 is about 282.9143776567.

Subtracting from 22644621 its reverse (12644622), we obtain a palindrome (9999999).

The spelling of 22644621 in words is "twenty-two million, six hundred forty-four thousand, six hundred twenty-one".