311221031312 has 20 divisors (see below), whose sum is σ = 603111284940. Its totient is φ = 155579409408.

The previous prime is 311221031281. The next prime is 311221031321. The reversal of 311221031312 is 213130122113.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 196866140416 + 114354890896 = 443696^2 + 338164^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1861493 + ... + 2021780.

It is an arithmetic number, because the mean of its divisors is an integer number (30155564247).

Almost surely, 2^311221031312 is an apocalyptic number.

It is an amenable number.

311221031312 is a deficient number, since it is larger than the sum of its proper divisors (291890253628).

311221031312 is a wasteful number, since it uses less digits than its factorization.

311221031312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3888290 (or 3888284 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 311221031312 its reverse (213130122113), we get a palindrome (524351153425).

The spelling of 311221031312 in words is "three hundred eleven billion, two hundred twenty-one million, thirty-one thousand, three hundred twelve".