204213 has 4 divisors (see below), whose sum is σ = 272288. Its totient is φ = 136140.

The previous prime is 204173. The next prime is 204233. The reversal of 204213 is 312402.

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 not a de Polignac number, because 204213 - 2¹² = 200117 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34033 + ... + 34038.

It is an arithmetic number, because the mean of its divisors is an integer number (68072).

2²⁰⁴²¹³ is an apocalyptic number.

It is an amenable number.

204213 is a deficient number, since it is larger than the sum of its proper divisors (68075).

204213 is an equidigital number, since it uses as much as digits as its factorization.

204213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68074.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 204213 is about 451.8993250714. The cubic root of 204213 is about 58.8881342941. Note that the first 3 decimals are identical.

Adding to 204213 its reverse (312402), we get a palindrome (516615).

The spelling of 204213 in words is "two hundred four thousand, two hundred thirteen".