311220120212 has 12 divisors (see below), whose sum is σ = 545744450496. Its totient is φ = 155293134360.

The previous prime is 311220120209. The next prime is 311220120217. The reversal of 311220120212 is 212021022113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311220120217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79229228 + ... + 79233155.

It is an arithmetic number, because the mean of its divisors is an integer number (45478704208).

Almost surely, 2^311220120212 is an apocalyptic number.

It is an amenable number.

311220120212 is a deficient number, since it is larger than the sum of its proper divisors (234524330284).

311220120212 is a wasteful number, since it uses less digits than its factorization.

311220120212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158462878 (or 158462876 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 311220120212 its reverse (212021022113), we get a palindrome (523241142325).

The spelling of 311220120212 in words is "three hundred eleven billion, two hundred twenty million, one hundred twenty thousand, two hundred twelve".