331121330221361 has 2 divisors, whose sum is σ = 331121330221362. Its totient is φ = 331121330221360.

The previous prime is 331121330221321. The next prime is 331121330221421. The reversal of 331121330221361 is 163122033121133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214609490997136 + 116511839224225 = 14649556^2 + 10794065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331121330221361 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (331121330221321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165560665110680 + 165560665110681.

It is an arithmetic number, because the mean of its divisors is an integer number (165560665110681).

Almost surely, 2^{331121330221361} is an apocalyptic number.

It is an amenable number.

331121330221361 is a deficient number, since it is larger than the sum of its proper divisors (1).

331121330221361 is an equidigital number, since it uses as much as digits as its factorization.

331121330221361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 32.

Adding to 331121330221361 its reverse (163122033121133), we get a palindrome (494243363342494).

The spelling of 331121330221361 in words is "three hundred thirty-one trillion, one hundred twenty-one billion, three hundred thirty million, two hundred twenty-one thousand, three hundred sixty-one".