311313221121 has 32 divisors (see below), whose sum is σ = 475927932928. Its totient is φ = 177314417280.

The previous prime is 311313221119. The next prime is 311313221137. The reversal of 311313221121 is 121122313113.

It is not a de Polignac number, because 311313221121 - 2¹ = 311313221119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (311313221171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9093366 + ... + 9127536.

It is an arithmetic number, because the mean of its divisors is an integer number (14872747904).

Almost surely, 2^311313221121 is an apocalyptic number.

It is an amenable number.

311313221121 is a deficient number, since it is larger than the sum of its proper divisors (164614711807).

311313221121 is a wasteful number, since it uses less digits than its factorization.

311313221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35581.

The product of its digits is 216, while the sum is 21.

Adding to 311313221121 its reverse (121122313113), we get a palindrome (432435534234).

The spelling of 311313221121 in words is "three hundred eleven billion, three hundred thirteen million, two hundred twenty-one thousand, one hundred twenty-one".