311121311211 has 12 divisors (see below), whose sum is σ = 449457236280. Its totient is φ = 207386613600.

The previous prime is 311121311209. The next prime is 311121311227. The reversal of 311121311211 is 112113121113.

311121311211 is a `hidden beast` number, since 31 + 112 + 1 + 311 + 211 = 666.

It is not a de Polignac number, because 311121311211 - 2¹ = 311121311209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (311121311201) 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 11 ways as a sum of consecutive naturals, for example, 2227965 + ... + 2363486.

It is an arithmetic number, because the mean of its divisors is an integer number (37454769690).

Almost surely, 2^311121311211 is an apocalyptic number.

311121311211 is a deficient number, since it is larger than the sum of its proper divisors (138335925069).

311121311211 is a wasteful number, since it uses less digits than its factorization.

311121311211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4598986 (or 4598983 counting only the distinct ones).

The product of its digits is 36, while the sum is 18.

Adding to 311121311211 its reverse (112113121113), we get a palindrome (423234432324).

The spelling of 311121311211 in words is "three hundred eleven billion, one hundred twenty-one million, three hundred eleven thousand, two hundred eleven".