321020513993 has 2 divisors, whose sum is σ = 321020513994. Its totient is φ = 321020513992.

The previous prime is 321020513987. The next prime is 321020514011. The reversal of 321020513993 is 399315020123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 312847811584 + 8172702409 = 559328^2 + 90403^2 .

It is a cyclic number.

It is not a de Polignac number, because 321020513993 - 2⁴ = 321020513977 is a prime.

It is not a weakly prime, because it can be changed into another prime (321020513903) 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, 160510256996 + 160510256997.

It is an arithmetic number, because the mean of its divisors is an integer number (160510256997).

Almost surely, 2^321020513993 is an apocalyptic number.

It is an amenable number.

321020513993 is a deficient number, since it is larger than the sum of its proper divisors (1).

321020513993 is an equidigital number, since it uses as much as digits as its factorization.

321020513993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43740, while the sum is 38.

The spelling of 321020513993 in words is "three hundred twenty-one billion, twenty million, five hundred thirteen thousand, nine hundred ninety-three".