31112212211 has 2 divisors, whose sum is σ = 31112212212. Its totient is φ = 31112212210.

The previous prime is 31112212189. The next prime is 31112212213. The reversal of 31112212211 is 11221221113.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (11221221113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31112212211 - 2²² = 31108017907 is a prime.

Together with 31112212213, 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 31112212211.

It is not a weakly prime, because it can be changed into another prime (31112212213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15556106105 + 15556106106.

It is an arithmetic number, because the mean of its divisors is an integer number (15556106106).

Almost surely, 2^31112212211 is an apocalyptic number.

31112212211 is a deficient number, since it is larger than the sum of its proper divisors (1).

31112212211 is an equidigital number, since it uses as much as digits as its factorization.

31112212211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48, while the sum is 17.

Adding to 31112212211 its reverse (11221221113), we get a palindrome (42333433324).

The spelling of 31112212211 in words is "thirty-one billion, one hundred twelve million, two hundred twelve thousand, two hundred eleven".