3216321 has 16 divisors (see below), whose sum is σ = 4804800. Its totient is φ = 2126304.

The previous prime is 3216289. The next prime is 3216331. The reversal of 3216321 is 1236123.

3216321 is a `hidden beast` number, since 32 + 1 + 632 + 1 = 666.

It is not a de Polignac number, because 3216321 - 2⁵ = 3216289 is a prime.

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

3216321 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3216294 and 3216303.

It is not an unprimeable number, because it can be changed into a prime (3216331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3325 + ... + 4181.

It is an arithmetic number, because the mean of its divisors is an integer number (300300).

Almost surely, 2^3216321 is an apocalyptic number.

It is an amenable number.

3216321 is a deficient number, since it is larger than the sum of its proper divisors (1588479).

3216321 is a wasteful number, since it uses less digits than its factorization.

3216321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005 (or 999 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 3216321 is about 1793.4104382433. The cubic root of 3216321 is about 147.6113647142.

The spelling of 3216321 in words is "three million, two hundred sixteen thousand, three hundred twenty-one".