311031300121021 has 2 divisors, whose sum is σ = 311031300121022. Its totient is φ = 311031300121020.

The previous prime is 311031300120967. The next prime is 311031300121163. The reversal of 311031300121021 is 120121003130113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 223718160898521 + 87313139222500 = 14957211^2 + 9344150^2 .

It is a cyclic number.

It is not a de Polignac number, because 311031300121021 - 2²⁵ = 311031266566589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311031300121021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311031300131021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155515650060510 + 155515650060511.

It is an arithmetic number, because the mean of its divisors is an integer number (155515650060511).

Almost surely, 2^{311031300121021} is an apocalyptic number.

It is an amenable number.

311031300121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

311031300121021 is an equidigital number, since it uses as much as digits as its factorization.

311031300121021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 311031300121021 its reverse (120121003130113), we get a palindrome (431152303251134).

The spelling of 311031300121021 in words is "three hundred eleven trillion, thirty-one billion, three hundred million, one hundred twenty-one thousand, twenty-one".