204421 has 16 divisors (see below), whose sum is σ = 259200. Its totient is φ = 157248.

The previous prime is 204397. The next prime is 204427. The reversal of 204421 is 124402.

204421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 204421 - 2⁹ = 203909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204427) 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, 3831 + ... + 3883.

It is an arithmetic number, because the mean of its divisors is an integer number (16200).

2²⁰⁴⁴²¹ is an apocalyptic number.

It is an amenable number.

204421 is a deficient number, since it is larger than the sum of its proper divisors (54779).

204421 is a wasteful number, since it uses less digits than its factorization.

204421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 204421 is about 452.1294062544. The cubic root of 204421 is about 58.9081209023.

Adding to 204421 its reverse (124402), we get a palindrome (328823).

It can be divided in two parts, 2044 and 21, that multiplied together give a palindrome (42924).

The spelling of 204421 in words is "two hundred four thousand, four hundred twenty-one", and thus it is an iban number.