391320033332321 has 2 divisors, whose sum is σ = 391320033332322. Its totient is φ = 391320033332320.

The previous prime is 391320033332287. The next prime is 391320033332339. The reversal of 391320033332321 is 123233330023193.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207891988771600 + 183428044560721 = 14418460^2 + 13543561^2 .

It is a cyclic number.

It is not a de Polignac number, because 391320033332321 - 2³⁸ = 391045155425377 is a prime.

It is not a weakly prime, because it can be changed into another prime (391320033302321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195660016666160 + 195660016666161.

It is an arithmetic number, because the mean of its divisors is an integer number (195660016666161).

Almost surely, 2^{391320033332321} is an apocalyptic number.

It is an amenable number.

391320033332321 is a deficient number, since it is larger than the sum of its proper divisors (1).

391320033332321 is an equidigital number, since it uses as much as digits as its factorization.

391320033332321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157464, while the sum is 38.

The spelling of 391320033332321 in words is "three hundred ninety-one trillion, three hundred twenty billion, thirty-three million, three hundred thirty-two thousand, three hundred twenty-one".