204443121 has 4 divisors (see below), whose sum is σ = 272590832. Its totient is φ = 136295412.

The previous prime is 204443119. The next prime is 204443131. The reversal of 204443121 is 121344402.

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 204443121 - 2¹ = 204443119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204443111) 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, 34073851 + ... + 34073856.

It is an arithmetic number, because the mean of its divisors is an integer number (68147708).

Almost surely, 2^204443121 is an apocalyptic number.

It is an amenable number.

204443121 is a deficient number, since it is larger than the sum of its proper divisors (68147711).

204443121 is an equidigital number, since it uses as much as digits as its factorization.

204443121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68147710.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 204443121 is about 14298.3607801734. The cubic root of 204443121 is about 589.1024569954.

Adding to 204443121 its reverse (121344402), we get a palindrome (325787523).

The spelling of 204443121 in words is "two hundred four million, four hundred forty-three thousand, one hundred twenty-one".