6321 has 12 divisors (see below), whose sum is σ = 10032. Its totient is φ = 3528.

The previous prime is 6317. The next prime is 6323. The reversal of 6321 is 1236.

It is not a de Polignac number, because 6321 - 2² = 6317 is a prime.

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

It is the 80-th Hogben number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6297 and 6306.

It is not an unprimeable number, because it can be changed into a prime (6323) by changing a digit.

It is a nontrivial repunit in base 79.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126 + ... + 168.

It is an arithmetic number, because the mean of its divisors is an integer number (836).

2⁶³²¹ is an apocalyptic number.

It is an amenable number.

6321 is a deficient number, since it is larger than the sum of its proper divisors (3711).

6321 is a wasteful number, since it uses less digits than its factorization.

6321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60 (or 53 counting only the distinct ones).

The product of its digits is 36, while the sum is 12.

The square root of 6321 is about 79.5047168412. The cubic root of 6321 is about 18.4896460202.

Adding to 6321 its reverse (1236), we get a palindrome (7557).

The spelling of 6321 in words is "six thousand, three hundred twenty-one".