311221321211013 has 4 divisors (see below), whose sum is σ = 414961761614688. Its totient is φ = 207480880807340.

The previous prime is 311221321210951. The next prime is 311221321211063. The reversal of 311221321211013 is 310112123122113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 311221321211013 - 2⁸ = 311221321210757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311221321211063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51870220201833 + ... + 51870220201838.

It is an arithmetic number, because the mean of its divisors is an integer number (103740440403672).

Almost surely, 2^{311221321211013} is an apocalyptic number.

It is an amenable number.

311221321211013 is a deficient number, since it is larger than the sum of its proper divisors (103740440403675).

311221321211013 is a wasteful number, since it uses less digits than its factorization.

311221321211013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103740440403674.

The product of its (nonzero) digits is 432, while the sum is 24.

Adding to 311221321211013 its reverse (310112123122113), we get a palindrome (621333444333126).

The spelling of 311221321211013 in words is "three hundred eleven trillion, two hundred twenty-one billion, three hundred twenty-one million, two hundred eleven thousand, thirteen".