321427321 has 2 divisors, whose sum is σ = 321427322. Its totient is φ = 321427320.

The previous prime is 321427307. The next prime is 321427333. The reversal of 321427321 is 123724123.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 266962921 + 54464400 = 16339^2 + 7380^2 .

It is a cyclic number.

It is not a de Polignac number, because 321427321 - 2⁵ = 321427289 is a prime.

It is not a weakly prime, because it can be changed into another prime (321487321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160713660 + 160713661.

It is an arithmetic number, because the mean of its divisors is an integer number (160713661).

Almost surely, 2^321427321 is an apocalyptic number.

It is an amenable number.

321427321 is a deficient number, since it is larger than the sum of its proper divisors (1).

321427321 is an equidigital number, since it uses as much as digits as its factorization.

321427321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 25.

The square root of 321427321 is about 17928.3942671953. The cubic root of 321427321 is about 685.0058223172.

The spelling of 321427321 in words is "three hundred twenty-one million, four hundred twenty-seven thousand, three hundred twenty-one".