311201221211 has 2 divisors, whose sum is σ = 311201221212. Its totient is φ = 311201221210.

The previous prime is 311201221189. The next prime is 311201221327. The reversal of 311201221211 is 112122102113.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 311201221211 - 2¹⁸ = 311200959067 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311201221211.

It is not a weakly prime, because it can be changed into another prime (311201229211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155600610605 + 155600610606.

It is an arithmetic number, because the mean of its divisors is an integer number (155600610606).

Almost surely, 2^311201221211 is an apocalyptic number.

311201221211 is a deficient number, since it is larger than the sum of its proper divisors (1).

311201221211 is an equidigital number, since it uses as much as digits as its factorization.

311201221211 is an evil number, because the sum of its binary digits is even.

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

Adding to 311201221211 its reverse (112122102113), we get a palindrome (423323323324).

The spelling of 311201221211 in words is "three hundred eleven billion, two hundred one million, two hundred twenty-one thousand, two hundred eleven".