311133213020 has 24 divisors (see below), whose sum is σ = 746719711584. Its totient is φ = 106674244416.

The previous prime is 311133212989. The next prime is 311133213037. The reversal of 311133213020 is 20312331113.

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 = 311133212983 and 311133213001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1111189907 + ... + 1111190186.

It is an arithmetic number, because the mean of its divisors is an integer number (31113321316).

Almost surely, 2^311133213020 is an apocalyptic number.

It is an amenable number.

311133213020 is an abundant number, since it is smaller than the sum of its proper divisors (435586498564).

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

311133213020 is a wasteful number, since it uses less digits than its factorization.

311133213020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222380109 (or 2222380107 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 311133213020 its reverse (20312331113), we get a palindrome (331445544133).

The spelling of 311133213020 in words is "three hundred eleven billion, one hundred thirty-three million, two hundred thirteen thousand, twenty".