20312222111 has 2 divisors, whose sum is σ = 20312222112. Its totient is φ = 20312222110.

The previous prime is 20312222089. The next prime is 20312222113. The reversal of 20312222111 is 11122221302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20312222111 - 2²⁶ = 20245113247 is a prime.

Together with 20312222113, 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 20312222111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20312222113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156111055 + 10156111056.

It is an arithmetic number, because the mean of its divisors is an integer number (10156111056).

Almost surely, 2^20312222111 is an apocalyptic number.

20312222111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312222111 is an equidigital number, since it uses as much as digits as its factorization.

20312222111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20312222111 its reverse (11122221302), we get a palindrome (31434443413).

The spelling of 20312222111 in words is "twenty billion, three hundred twelve million, two hundred twenty-two thousand, one hundred eleven".