321604121 has 2 divisors, whose sum is σ = 321604122. Its totient is φ = 321604120.

The previous prime is 321604117. The next prime is 321604163. The reversal of 321604121 is 121406123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 307616521 + 13987600 = 17539^2 + 3740^2 .

It is a cyclic number.

It is not a de Polignac number, because 321604121 - 2² = 321604117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 321604093 and 321604102.

It is not a weakly prime, because it can be changed into another prime (321604021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160802060 + 160802061.

It is an arithmetic number, because the mean of its divisors is an integer number (160802061).

Almost surely, 2^321604121 is an apocalyptic number.

It is an amenable number.

321604121 is a deficient number, since it is larger than the sum of its proper divisors (1).

321604121 is an equidigital number, since it uses as much as digits as its factorization.

321604121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 321604121 is about 17933.3243153633. The cubic root of 321604121 is about 685.1313943341.

The spelling of 321604121 in words is "three hundred twenty-one million, six hundred four thousand, one hundred twenty-one".