311120021021 has 2 divisors, whose sum is σ = 311120021022. Its totient is φ = 311120021020.

The previous prime is 311120020999. The next prime is 311120021039. The reversal of 311120021021 is 120120021113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 285144252121 + 25975768900 = 533989^2 + 161170^2 .

It is an emirp because it is prime and its reverse (120120021113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311120021021 - 2³⁴ = 293940151837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 311120020987 and 311120021005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311120021071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155560010510 + 155560010511.

It is an arithmetic number, because the mean of its divisors is an integer number (155560010511).

Almost surely, 2^311120021021 is an apocalyptic number.

It is an amenable number.

311120021021 is a deficient number, since it is larger than the sum of its proper divisors (1).

311120021021 is an equidigital number, since it uses as much as digits as its factorization.

311120021021 is an evil number, because the sum of its binary digits is even.

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

Adding to 311120021021 its reverse (120120021113), we get a palindrome (431240042134).

The spelling of 311120021021 in words is "three hundred eleven billion, one hundred twenty million, twenty-one thousand, twenty-one".