311121030212 has 12 divisors (see below), whose sum is σ = 544466099436. Its totient is φ = 155559287520.

The previous prime is 311121030179. The next prime is 311121030229. The reversal of 311121030212 is 212030121113.

It can be written as a sum of positive squares in 2 ways, for example, as 205114786816 + 106006243396 = 452896^2 + 325586^2 .

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, 497762 + ... + 932742.

It is an arithmetic number, because the mean of its divisors is an integer number (45372174953).

Almost surely, 2^311121030212 is an apocalyptic number.

It is an amenable number.

311121030212 is a deficient number, since it is larger than the sum of its proper divisors (233345069224).

311121030212 is a wasteful number, since it uses less digits than its factorization.

311121030212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613798 (or 613796 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 311121030212 its reverse (212030121113), we get a palindrome (523151151325).

Subtracting from 311121030212 its reverse (212030121113), we obtain a palindrome (99090909099).

The spelling of 311121030212 in words is "three hundred eleven billion, one hundred twenty-one million, thirty thousand, two hundred twelve".