2108321 has 4 divisors (see below), whose sum is σ = 2132100. Its totient is φ = 2084544.

The previous prime is 2108317. The next prime is 2108339. The reversal of 2108321 is 1238012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 190096 + 1918225 = 436^2 + 1385^2 .

It is a cyclic number.

It is not a de Polignac number, because 2108321 - 2² = 2108317 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2108321.

It is not an unprimeable number, because it can be changed into a prime (2108521) 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, 11756 + ... + 11933.

It is an arithmetic number, because the mean of its divisors is an integer number (533025).

2^2108321 is an apocalyptic number.

It is an amenable number.

2108321 is a deficient number, since it is larger than the sum of its proper divisors (23779).

2108321 is an equidigital number, since it uses as much as digits as its factorization.

2108321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23778.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 2108321 is about 1452.0058539827. The cubic root of 2108321 is about 128.2268316758.

Subtracting from 2108321 its sum of digits (17), we obtain a square (2108304 = 1452²).

The spelling of 2108321 in words is "two million, one hundred eight thousand, three hundred twenty-one".