311322120312 has 128 divisors (see below), whose sum is σ = 920995200000. Its totient is φ = 85804379136.

The previous prime is 311322120281. The next prime is 311322120367. The reversal of 311322120312 is 213021223113.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5472189 + ... + 5528787.

It is an arithmetic number, because the mean of its divisors is an integer number (7195275000).

Almost surely, 2^311322120312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 311322120312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (460497600000).

311322120312 is an abundant number, since it is smaller than the sum of its proper divisors (609673079688).

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

311322120312 is a wasteful number, since it uses less digits than its factorization.

311322120312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57773 (or 57769 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 311322120312 its reverse (213021223113), we get a palindrome (524343343425).

The spelling of 311322120312 in words is "three hundred eleven billion, three hundred twenty-two million, one hundred twenty thousand, three hundred twelve".