321520621117 has 2 divisors, whose sum is σ = 321520621118. Its totient is φ = 321520621116.

The previous prime is 321520621063. The next prime is 321520621133. The reversal of 321520621117 is 711126025123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241578148036 + 79942473081 = 491506^2 + 282741^2 .

It is a cyclic number.

It is not a de Polignac number, because 321520621117 - 2⁷ = 321520620989 is a prime.

It is a super-2 number, since 2×321520621117² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321520621417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160760310558 + 160760310559.

It is an arithmetic number, because the mean of its divisors is an integer number (160760310559).

Almost surely, 2^321520621117 is an apocalyptic number.

It is an amenable number.

321520621117 is a deficient number, since it is larger than the sum of its proper divisors (1).

321520621117 is an equidigital number, since it uses as much as digits as its factorization.

321520621117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 31.

It can be divided in two parts, 3215206 and 21117, that added together give a palindrome (3236323).

The spelling of 321520621117 in words is "three hundred twenty-one billion, five hundred twenty million, six hundred twenty-one thousand, one hundred seventeen".