311220022131 has 6 divisors (see below), whose sum is σ = 449540031980. Its totient is φ = 207480014748.

The previous prime is 311220022123. The next prime is 311220022163. The reversal of 311220022131 is 131220022113.

311220022131 is a `hidden beast` number, since 311 + 2 + 200 + 22 + 131 = 666.

It is not a de Polignac number, because 311220022131 - 2³ = 311220022123 is a prime.

It is a super-2 number, since 2×311220022131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311220022121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17290001221 + ... + 17290001238.

Almost surely, 2^311220022131 is an apocalyptic number.

311220022131 is a deficient number, since it is larger than the sum of its proper divisors (138320009849).

311220022131 is a wasteful number, since it uses less digits than its factorization.

311220022131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34580002465 (or 34580002462 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Subtracting from 311220022131 its sum of digits (18), we obtain a palindrome (311220022113).

Adding to 311220022131 its reverse (131220022113), we get a palindrome (442440044244).

The spelling of 311220022131 in words is "three hundred eleven billion, two hundred twenty million, twenty-two thousand, one hundred thirty-one".