204242130215 has 4 divisors (see below), whose sum is σ = 245090556264. Its totient is φ = 163393704168.

The previous prime is 204242130161. The next prime is 204242130241. The reversal of 204242130215 is 512031242402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204242130215 is a prime.

It is a super-2 number, since 2×204242130215² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20424213017 + ... + 20424213026.

It is an arithmetic number, because the mean of its divisors is an integer number (61272639066).

Almost surely, 2^204242130215 is an apocalyptic number.

204242130215 is a deficient number, since it is larger than the sum of its proper divisors (40848426049).

204242130215 is an equidigital number, since it uses as much as digits as its factorization.

204242130215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40848426048.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 204242130215 its reverse (512031242402), we get a palindrome (716273372617).

The spelling of 204242130215 in words is "two hundred four billion, two hundred forty-two million, one hundred thirty thousand, two hundred fifteen".