311203313212 has 96 divisors (see below), whose sum is σ = 631847462400. Its totient is φ = 132629011200.

The previous prime is 311203313191. The next prime is 311203313219. The reversal of 311203313212 is 212313302113.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311203313219) 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 31 ways as a sum of consecutive naturals, for example, 118733262 + ... + 118735882.

It is an arithmetic number, because the mean of its divisors is an integer number (6581744400).

Almost surely, 2^311203313212 is an apocalyptic number.

It is an amenable number.

311203313212 is an abundant number, since it is smaller than the sum of its proper divisors (320644149188).

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

311203313212 is a wasteful number, since it uses less digits than its factorization.

311203313212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4067 (or 4065 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 311203313212 its reverse (212313302113), we get a palindrome (523516615325).

The spelling of 311203313212 in words is "three hundred eleven billion, two hundred three million, three hundred thirteen thousand, two hundred twelve".