311230112021 has 2 divisors, whose sum is σ = 311230112022. Its totient is φ = 311230112020.

The previous prime is 311230112003. The next prime is 311230112077. The reversal of 311230112021 is 120211032113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183985234225 + 127244877796 = 428935^2 + 356714^2 .

It is a cyclic number.

It is not a de Polignac number, because 311230112021 - 2¹⁴ = 311230095637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311230112521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155615056010 + 155615056011.

It is an arithmetic number, because the mean of its divisors is an integer number (155615056011).

Almost surely, 2^311230112021 is an apocalyptic number.

It is an amenable number.

311230112021 is a deficient number, since it is larger than the sum of its proper divisors (1).

311230112021 is an equidigital number, since it uses as much as digits as its factorization.

311230112021 is an evil number, because the sum of its binary digits is even.

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

Adding to 311230112021 its reverse (120211032113), we get a palindrome (431441144134).

The spelling of 311230112021 in words is "three hundred eleven billion, two hundred thirty million, one hundred twelve thousand, twenty-one".