321997863693773 has 2 divisors, whose sum is σ = 321997863693774. Its totient is φ = 321997863693772.

The previous prime is 321997863693763. The next prime is 321997863693809. The reversal of 321997863693773 is 377396368799123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 316146820348324 + 5851043345449 = 17780518^2 + 2418893^2 .

It is a cyclic number.

It is not a de Polignac number, because 321997863693773 - 2²⁶ = 321997796584909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 321997863693691 and 321997863693700.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321997863693763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160998931846886 + 160998931846887.

It is an arithmetic number, because the mean of its divisors is an integer number (160998931846887).

Almost surely, 2^{321997863693773} is an apocalyptic number.

It is an amenable number.

321997863693773 is a deficient number, since it is larger than the sum of its proper divisors (1).

321997863693773 is an equidigital number, since it uses as much as digits as its factorization.

321997863693773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11666192832, while the sum is 83.

The spelling of 321997863693773 in words is "three hundred twenty-one trillion, nine hundred ninety-seven billion, eight hundred sixty-three million, six hundred ninety-three thousand, seven hundred seventy-three".