311121212 has 6 divisors (see below), whose sum is σ = 544462128. Its totient is φ = 155560604.

The previous prime is 311121169. The next prime is 311121221. The reversal of 311121212 is 212121113.

311121212 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38890148 + ... + 38890155.

It is an arithmetic number, because the mean of its divisors is an integer number (90743688).

Almost surely, 2^311121212 is an apocalyptic number.

It is an amenable number.

311121212 is a deficient number, since it is larger than the sum of its proper divisors (233340916).

311121212 is a wasteful number, since it uses less digits than its factorization.

311121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77780307 (or 77780305 counting only the distinct ones).

The product of its digits is 24, while the sum is 14.

The square root of 311121212 is about 17638.6284047258. The cubic root of 311121212 is about 677.6049043496.

Adding to 311121212 its reverse (212121113), we get a palindrome (523242325).

Subtracting from 311121212 its reverse (212121113), we obtain a palindrome (99000099).

The spelling of 311121212 in words is "three hundred eleven million, one hundred twenty-one thousand, two hundred twelve".