19328321 has 2 divisors, whose sum is σ = 19328322. Its totient is φ = 19328320.

The previous prime is 19328299. The next prime is 19328329. The reversal of 19328321 is 12382391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13987600 + 5340721 = 3740^2 + 2311^2 .

It is a cyclic number.

It is not a de Polignac number, because 19328321 - 2¹⁴ = 19311937 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (19328329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9664160 + 9664161.

It is an arithmetic number, because the mean of its divisors is an integer number (9664161).

Almost surely, 2^19328321 is an apocalyptic number.

It is an amenable number.

19328321 is a deficient number, since it is larger than the sum of its proper divisors (1).

19328321 is an equidigital number, since it uses as much as digits as its factorization.

19328321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The square root of 19328321 is about 4396.3986397960. The cubic root of 19328321 is about 268.3683997569.

The spelling of 19328321 in words is "nineteen million, three hundred twenty-eight thousand, three hundred twenty-one".