204021434005 has 4 divisors (see below), whose sum is σ = 244825720812. Its totient is φ = 163217147200.

The previous prime is 204021434003. The next prime is 204021434051. The reversal of 204021434005 is 500434120402.

It is a happy number.

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 29252287089 + 174769146916 = 171033^2 + 418054^2 .

It is not a de Polignac number, because 204021434005 - 2¹ = 204021434003 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 (204021434003) 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, 20402143396 + ... + 20402143405.

It is an arithmetic number, because the mean of its divisors is an integer number (61206430203).

Almost surely, 2^204021434005 is an apocalyptic number.

It is an amenable number.

204021434005 is a deficient number, since it is larger than the sum of its proper divisors (40804286807).

204021434005 is an equidigital number, since it uses as much as digits as its factorization.

204021434005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40804286806.

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 204021434005 its reverse (500434120402), we get a palindrome (704455554407).

The spelling of 204021434005 in words is "two hundred four billion, twenty-one million, four hundred thirty-four thousand, five".