22211221121 has 4 divisors (see below), whose sum is σ = 22542731952. Its totient is φ = 21879710292.

The previous prime is 22211221111. The next prime is 22211221169. The reversal of 22211221121 is 12112211222.

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 22211221121 - 2³⁴ = 5031351937 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 22211221121.

It is not an unprimeable number, because it can be changed into a prime (22211221111) 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, 165755315 + ... + 165755448.

It is an arithmetic number, because the mean of its divisors is an integer number (5635682988).

Almost surely, 2^22211221121 is an apocalyptic number.

It is an amenable number.

22211221121 is a deficient number, since it is larger than the sum of its proper divisors (331510831).

22211221121 is an equidigital number, since it uses as much as digits as its factorization.

22211221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331510830.

The product of its digits is 64, while the sum is 17.

Adding to 22211221121 its reverse (12112211222), we get a palindrome (34323432343).

The spelling of 22211221121 in words is "twenty-two billion, two hundred eleven million, two hundred twenty-one thousand, one hundred twenty-one".