331230020921 has 2 divisors, whose sum is σ = 331230020922. Its totient is φ = 331230020920.

The previous prime is 331230020917. The next prime is 331230021053. The reversal of 331230020921 is 129020032133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191309137321 + 139920883600 = 437389^2 + 374060^2 .

It is a cyclic number.

It is not a de Polignac number, because 331230020921 - 2² = 331230020917 is a prime.

It is not a weakly prime, because it can be changed into another prime (331230020521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165615010460 + 165615010461.

It is an arithmetic number, because the mean of its divisors is an integer number (165615010461).

Almost surely, 2^331230020921 is an apocalyptic number.

It is an amenable number.

331230020921 is a deficient number, since it is larger than the sum of its proper divisors (1).

331230020921 is an equidigital number, since it uses as much as digits as its factorization.

331230020921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 26.

The spelling of 331230020921 in words is "three hundred thirty-one billion, two hundred thirty million, twenty thousand, nine hundred twenty-one".