311202313212 has 48 divisors (see below), whose sum is σ = 841561201152. Its totient is φ = 87662621760.

The previous prime is 311202313199. The next prime is 311202313229. The reversal of 311202313212 is 212313202113.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26084103 + ... + 26096030.

It is an arithmetic number, because the mean of its divisors is an integer number (17532525024).

Almost surely, 2^311202313212 is an apocalyptic number.

It is an amenable number.

311202313212 is an abundant number, since it is smaller than the sum of its proper divisors (530358887940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

311202313212 is a wasteful number, since it uses less digits than its factorization.

311202313212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52180218 (or 52180216 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 311202313212 its reverse (212313202113), we get a palindrome (523515515325).

The spelling of 311202313212 in words is "three hundred eleven billion, two hundred two million, three hundred thirteen thousand, two hundred twelve".