204405210243 has 12 divisors (see below), whose sum is σ = 317963660560. Its totient is φ = 125787821616.

The previous prime is 204405210203. The next prime is 204405210257. The reversal of 204405210243 is 342012504402.

204405210243 is a `hidden beast` number, since 2 + 0 + 4 + 405 + 2 + 10 + 243 = 666.

It is not a de Polignac number, because 204405210243 - 2²⁶ = 204338101379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (204405210203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 873526423 + ... + 873526656.

Almost surely, 2^204405210243 is an apocalyptic number.

204405210243 is a deficient number, since it is larger than the sum of its proper divisors (113558450317).

204405210243 is a wasteful number, since it uses less digits than its factorization.

204405210243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1747053098 (or 1747053095 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

Adding to 204405210243 its reverse (342012504402), we get a palindrome (546417714645).

The spelling of 204405210243 in words is "two hundred four billion, four hundred five million, two hundred ten thousand, two hundred forty-three".