206321 has 4 divisors (see below), whose sum is σ = 217200. Its totient is φ = 195444.

The previous prime is 206303. The next prime is 206341. The reversal of 206321 is 123602.

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.

It is a cyclic number.

It is not a de Polignac number, because 206321 - 2¹⁰ = 205297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206296 and 206305.

It is not an unprimeable number, because it can be changed into a prime (206341) 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, 5411 + ... + 5448.

It is an arithmetic number, because the mean of its divisors is an integer number (54300).

2²⁰⁶³²¹ is an apocalyptic number.

It is an amenable number.

206321 is a deficient number, since it is larger than the sum of its proper divisors (10879).

206321 is a wasteful number, since it uses less digits than its factorization.

206321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10878.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 206321 is about 454.2257148159. The cubic root of 206321 is about 59.0900664036.

Adding to 206321 its reverse (123602), we get a palindrome (329923).

The spelling of 206321 in words is "two hundred six thousand, three hundred twenty-one".