204442404013021 has 4 divisors (see below), whose sum is σ = 204463182801600. Its totient is φ = 204421625224444.

The previous prime is 204442404013013. The next prime is 204442404013049. The reversal of 204442404013021 is 120310404244402.

It is a happy number.

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 204442404013021 - 2³ = 204442404013013 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 (204442407013021) 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, 10389379531 + ... + 10389399208.

It is an arithmetic number, because the mean of its divisors is an integer number (51115795700400).

Almost surely, 2^{204442404013021} is an apocalyptic number.

It is an amenable number.

204442404013021 is a deficient number, since it is larger than the sum of its proper divisors (20778788579).

204442404013021 is an equidigital number, since it uses as much as digits as its factorization.

204442404013021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20778788578.

The product of its (nonzero) digits is 24576, while the sum is 31.

Adding to 204442404013021 its reverse (120310404244402), we get a palindrome (324752808257423).

The spelling of 204442404013021 in words is "two hundred four trillion, four hundred forty-two billion, four hundred four million, thirteen thousand, twenty-one".