204255135123 has 24 divisors (see below), whose sum is σ = 294959648880. Its totient is φ = 125670430080.

The previous prime is 204255135113. The next prime is 204255135197. The reversal of 204255135123 is 321531552402.

204255135123 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 204255135123 - 2¹⁸ = 204254872979 is a prime.

It is a super-2 number, since 2×204255135123² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (204255135113) 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 23 ways as a sum of consecutive naturals, for example, 2690733 + ... + 2765601.

It is an arithmetic number, because the mean of its divisors is an integer number (12289985370).

Almost surely, 2^204255135123 is an apocalyptic number.

204255135123 is a deficient number, since it is larger than the sum of its proper divisors (90704513757).

204255135123 is a wasteful number, since it uses less digits than its factorization.

204255135123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80279 (or 80266 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

Adding to 204255135123 its reverse (321531552402), we get a palindrome (525786687525).

The spelling of 204255135123 in words is "two hundred four billion, two hundred fifty-five million, one hundred thirty-five thousand, one hundred twenty-three".