22331122221 has 4 divisors (see below), whose sum is σ = 29774829632. Its totient is φ = 14887414812.

The previous prime is 22331122169. The next prime is 22331122241. The reversal of 22331122221 is 12222113322.

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 not a de Polignac number, because 22331122221 - 2¹¹ = 22331120173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22331122241) 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, 3721853701 + ... + 3721853706.

It is an arithmetic number, because the mean of its divisors is an integer number (7443707408).

Almost surely, 2^22331122221 is an apocalyptic number.

It is an amenable number.

22331122221 is a deficient number, since it is larger than the sum of its proper divisors (7443707411).

22331122221 is an equidigital number, since it uses as much as digits as its factorization.

22331122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7443707410.

The product of its digits is 576, while the sum is 21.

Adding to 22331122221 its reverse (12222113322), we get a palindrome (34553235543).

The spelling of 22331122221 in words is "twenty-two billion, three hundred thirty-one million, one hundred twenty-two thousand, two hundred twenty-one".