205521135132 has 12 divisors (see below), whose sum is σ = 479549315336. Its totient is φ = 68507045040.

The previous prime is 205521135059. The next prime is 205521135139. The reversal of 205521135132 is 231531125502.

205521135132 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 205521135132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205521135139) 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 3 ways as a sum of consecutive naturals, for example, 8563380619 + ... + 8563380642.

Almost surely, 2^205521135132 is an apocalyptic number.

It is an amenable number.

205521135132 is an abundant number, since it is smaller than the sum of its proper divisors (274028180204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205521135132 is a wasteful number, since it uses less digits than its factorization.

205521135132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17126761268 (or 17126761266 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The spelling of 205521135132 in words is "two hundred five billion, five hundred twenty-one million, one hundred thirty-five thousand, one hundred thirty-two".