22591621 has 8 divisors (see below), whose sum is σ = 24789240. Its totient is φ = 20459712.

The previous prime is 22591601. The next prime is 22591633. The reversal of 22591621 is 12619522.

It can be written as a sum of positive squares in 4 ways, for example, as 2070721 + 20520900 = 1439^2 + 4530^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22591621 - 2⁹ = 22591109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22591621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22591601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15706 + ... + 17083.

It is an arithmetic number, because the mean of its divisors is an integer number (3098655).

Almost surely, 2^22591621 is an apocalyptic number.

It is an amenable number.

22591621 is a deficient number, since it is larger than the sum of its proper divisors (2197619).

22591621 is a wasteful number, since it uses less digits than its factorization.

22591621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32855.

The product of its digits is 2160, while the sum is 28.

The square root of 22591621 is about 4753.0643799553. The cubic root of 22591621 is about 282.6934837634.

The spelling of 22591621 in words is "twenty-two million, five hundred ninety-one thousand, six hundred twenty-one".