204102135217 has 8 divisors (see below), whose sum is σ = 224185412160. Its totient is φ = 184952964240.

The previous prime is 204102135197. The next prime is 204102135239. The reversal of 204102135217 is 712531201402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204102135217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204102135917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233526034 + ... + 233526907.

It is an arithmetic number, because the mean of its divisors is an integer number (28023176520).

Almost surely, 2^204102135217 is an apocalyptic number.

It is an amenable number.

204102135217 is a deficient number, since it is larger than the sum of its proper divisors (20083276943).

204102135217 is a wasteful number, since it uses less digits than its factorization.

204102135217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467052983.

The product of its (nonzero) digits is 3360, while the sum is 28.

Adding to 204102135217 its reverse (712531201402), we get a palindrome (916633336619).

The spelling of 204102135217 in words is "two hundred four billion, one hundred two million, one hundred thirty-five thousand, two hundred seventeen".