204042217 has 4 divisors (see below), whose sum is σ = 210624256. Its totient is φ = 197460180.

The previous prime is 204042203. The next prime is 204042221. The reversal of 204042217 is 712240402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204042217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204042287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3290973 + ... + 3291034.

It is an arithmetic number, because the mean of its divisors is an integer number (52656064).

Almost surely, 2^204042217 is an apocalyptic number.

It is an amenable number.

204042217 is a deficient number, since it is larger than the sum of its proper divisors (6582039).

204042217 is an equidigital number, since it uses as much as digits as its factorization.

204042217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6582038.

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 204042217 is about 14284.3346712404. The cubic root of 204042217 is about 588.7171369873.

Adding to 204042217 its reverse (712240402), we get a palindrome (916282619).

The spelling of 204042217 in words is "two hundred four million, forty-two thousand, two hundred seventeen".