321406417272791 has 2 divisors, whose sum is σ = 321406417272792. Its totient is φ = 321406417272790.

The previous prime is 321406417272691. The next prime is 321406417272817. The reversal of 321406417272791 is 197272714604123.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 321406417272791 - 2³⁴ = 321389237403607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321406417272691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160703208636395 + 160703208636396.

It is an arithmetic number, because the mean of its divisors is an integer number (160703208636396).

Almost surely, 2^{321406417272791} is an apocalyptic number.

321406417272791 is a deficient number, since it is larger than the sum of its proper divisors (1).

321406417272791 is an equidigital number, since it uses as much as digits as its factorization.

321406417272791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7112448, while the sum is 56.

The spelling of 321406417272791 in words is "three hundred twenty-one trillion, four hundred six billion, four hundred seventeen million, two hundred seventy-two thousand, seven hundred ninety-one".