31122013211 has 2 divisors, whose sum is σ = 31122013212. Its totient is φ = 31122013210.

The previous prime is 31122013199. The next prime is 31122013231. The reversal of 31122013211 is 11231022113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31122013211 - 2²⁶ = 31054904347 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31122013211.

It is not a weakly prime, because it can be changed into another prime (31122013231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561006605 + 15561006606.

It is an arithmetic number, because the mean of its divisors is an integer number (15561006606).

Almost surely, 2^31122013211 is an apocalyptic number.

31122013211 is a deficient number, since it is larger than the sum of its proper divisors (1).

31122013211 is an equidigital number, since it uses as much as digits as its factorization.

31122013211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31122013211 its reverse (11231022113), we get a palindrome (42353035324).

The spelling of 31122013211 in words is "thirty-one billion, one hundred twenty-two million, thirteen thousand, two hundred eleven".