22222121111 has 2 divisors, whose sum is σ = 22222121112. Its totient is φ = 22222121110.

The previous prime is 22222121093. The next prime is 22222121113. The reversal of 22222121111 is 11112122222.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22222121111 - 2³⁴ = 5042251927 is a prime.

Together with 22222121113, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22222121111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22222121113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11111060555 + 11111060556.

It is an arithmetic number, because the mean of its divisors is an integer number (11111060556).

Almost surely, 2^22222121111 is an apocalyptic number.

22222121111 is a deficient number, since it is larger than the sum of its proper divisors (1).

22222121111 is an equidigital number, since it uses as much as digits as its factorization.

22222121111 is an evil number, because the sum of its binary digits is even.

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

Adding to 22222121111 its reverse (11112122222), we get a palindrome (33334243333).

The spelling of 22222121111 in words is "twenty-two billion, two hundred twenty-two million, one hundred twenty-one thousand, one hundred eleven".