311302122320 has 80 divisors (see below), whose sum is σ = 846410885760. Its totient is φ = 104250004992.

The previous prime is 311302122319. The next prime is 311302122323. The reversal of 311302122320 is 23221203113.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×311302122320² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 311302122292 and 311302122301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311302122323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6439835 + ... + 6487994.

It is an arithmetic number, because the mean of its divisors is an integer number (10580136072).

Almost surely, 2^311302122320 is an apocalyptic number.

It is an amenable number.

311302122320 is an abundant number, since it is smaller than the sum of its proper divisors (535108763440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

311302122320 is a wasteful number, since it uses less digits than its factorization.

311302122320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12927892 (or 12927886 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 311302122320 its reverse (23221203113), we get a palindrome (334523325433).

The spelling of 311302122320 in words is "three hundred eleven billion, three hundred two million, one hundred twenty-two thousand, three hundred twenty".