22651232221 has 4 divisors (see below), whose sum is σ = 22661863744. Its totient is φ = 22640600700.

The previous prime is 22651232173. The next prime is 22651232251. The reversal of 22651232221 is 12223215622.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22651232221 - 2⁹ = 22651231709 is a prime.

It is a super-2 number, since 2×22651232221² (a number of 22 digits) contains 22 as substring.

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 22651232221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22651232251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5312565 + ... + 5316826.

It is an arithmetic number, because the mean of its divisors is an integer number (5665465936).

Almost surely, 2^22651232221 is an apocalyptic number.

It is an amenable number.

22651232221 is a deficient number, since it is larger than the sum of its proper divisors (10631523).

22651232221 is a wasteful number, since it uses less digits than its factorization.

22651232221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10631522.

The product of its digits is 5760, while the sum is 28.

Adding to 22651232221 its reverse (12223215622), we get a palindrome (34874447843).

The spelling of 22651232221 in words is "twenty-two billion, six hundred fifty-one million, two hundred thirty-two thousand, two hundred twenty-one".