311130013021 has 2 divisors, whose sum is σ = 311130013022. Its totient is φ = 311130013020.

The previous prime is 311130013013. The next prime is 311130013063. The reversal of 311130013021 is 120310031113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177182064900 + 133947948121 = 420930^2 + 365989^2 .

It is an emirp because it is prime and its reverse (120310031113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311130013021 - 2³ = 311130013013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 311130012986 and 311130013004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311130011021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155565006510 + 155565006511.

It is an arithmetic number, because the mean of its divisors is an integer number (155565006511).

Almost surely, 2^311130013021 is an apocalyptic number.

It is an amenable number.

311130013021 is a deficient number, since it is larger than the sum of its proper divisors (1).

311130013021 is an equidigital number, since it uses as much as digits as its factorization.

311130013021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 311130013021 its reverse (120310031113), we get a palindrome (431440044134).

The spelling of 311130013021 in words is "three hundred eleven billion, one hundred thirty million, thirteen thousand, twenty-one".