204102111 has 4 divisors (see below), whose sum is σ = 272136152. Its totient is φ = 136068072.

The previous prime is 204102097. The next prime is 204102121. The reversal of 204102111 is 111201402.

It is a happy number.

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

It is not a de Polignac number, because 204102111 - 2¹⁰ = 204101087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204102121) 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, 34017016 + ... + 34017021.

It is an arithmetic number, because the mean of its divisors is an integer number (68034038).

Almost surely, 2^204102111 is an apocalyptic number.

204102111 is a deficient number, since it is larger than the sum of its proper divisors (68034041).

204102111 is an equidigital number, since it uses as much as digits as its factorization.

204102111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68034040.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 204102111 is about 14286.4310098779. The cubic root of 204102111 is about 588.7747348302.

Adding to 204102111 its reverse (111201402), we get a palindrome (315303513).

The spelling of 204102111 in words is "two hundred four million, one hundred two thousand, one hundred eleven".