204424545521 has 16 divisors (see below), whose sum is σ = 237058202880. Its totient is φ = 172651335360.

The previous prime is 204424545509. The next prime is 204424545553. The reversal of 204424545521 is 125545424402.

204424545521 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 204424545521 - 2¹⁰ = 204424544497 is a prime.

It is a super-2 number, since 2×204424545521² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (204424545581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 729035 + ... + 969711.

It is an arithmetic number, because the mean of its divisors is an integer number (14816137680).

Almost surely, 2^204424545521 is an apocalyptic number.

It is an amenable number.

204424545521 is a deficient number, since it is larger than the sum of its proper divisors (32633657359).

204424545521 is a wasteful number, since it uses less digits than its factorization.

204424545521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242464.

The product of its (nonzero) digits is 256000, while the sum is 38.

Adding to 204424545521 its reverse (125545424402), we get a palindrome (329969969923).

The spelling of 204424545521 in words is "two hundred four billion, four hundred twenty-four million, five hundred forty-five thousand, five hundred twenty-one".