16321 has 4 divisors (see below), whose sum is σ = 17200. Its totient is φ = 15444.

The previous prime is 16319. The next prime is 16333. The reversal of 16321 is 12361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12361 = 47 ⋅263.

It is a cyclic number.

It is not a de Polignac number, because 16321 - 2¹ = 16319 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (16301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 411 + ... + 448.

It is an arithmetic number, because the mean of its divisors is an integer number (4300).

2¹⁶³²¹ is an apocalyptic number.

It is an amenable number.

16321 is a deficient number, since it is larger than the sum of its proper divisors (879).

16321 is an equidigital number, since it uses as much as digits as its factorization.

16321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878.

The product of its digits is 36, while the sum is 13.

The square root of 16321 is about 127.7536692232. The cubic root of 16321 is about 25.3658208931.

Adding to 16321 its reverse (12361), we get a palindrome (28682).

The spelling of 16321 in words is "sixteen thousand, three hundred twenty-one".