321921361 has 2 divisors, whose sum is σ = 321921362. Its totient is φ = 321921360.

The previous prime is 321921337. The next prime is 321921449. The reversal of 321921361 is 163129123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 255008961 + 66912400 = 15969^2 + 8180^2 .

It is a cyclic number.

It is not a de Polignac number, because 321921361 - 2⁹ = 321920849 is a prime.

It is not a weakly prime, because it can be changed into another prime (321921331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160960680 + 160960681.

It is an arithmetic number, because the mean of its divisors is an integer number (160960681).

Almost surely, 2^321921361 is an apocalyptic number.

It is an amenable number.

321921361 is a deficient number, since it is larger than the sum of its proper divisors (1).

321921361 is an equidigital number, since it uses as much as digits as its factorization.

321921361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 28.

The square root of 321921361 is about 17942.1671210587. The cubic root of 321921361 is about 685.3565983881.

The spelling of 321921361 in words is "three hundred twenty-one million, nine hundred twenty-one thousand, three hundred sixty-one".