2163321 has 16 divisors (see below), whose sum is σ = 3374400. Its totient is φ = 1365984.

The previous prime is 2163307. The next prime is 2163341. The reversal of 2163321 is 1233612.

It is not a de Polignac number, because 2163321 - 2⁵ = 2163289 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2163294 and 2163303.

It is not an unprimeable number, because it can be changed into a prime (2163341) 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, 1596 + ... + 2621.

It is an arithmetic number, because the mean of its divisors is an integer number (210900).

2^2163321 is an apocalyptic number.

It is an amenable number.

2163321 is a deficient number, since it is larger than the sum of its proper divisors (1211079).

2163321 is a wasteful number, since it uses less digits than its factorization.

2163321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4245 (or 4239 counting only the distinct ones).

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

The square root of 2163321 is about 1470.8232388700. The cubic root of 2163321 is about 129.3322963451.

Adding to 2163321 its reverse (1233612), we get a palindrome (3396933).

The spelling of 2163321 in words is "two million, one hundred sixty-three thousand, three hundred twenty-one".