204121112111 has 16 divisors (see below), whose sum is σ = 236966197248. Its totient is φ = 172205577600.

The previous prime is 204121112087. The next prime is 204121112119. The reversal of 204121112111 is 111211121402.

It is not a de Polignac number, because 204121112111 - 2³⁰ = 203047370287 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204121112111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204121112119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51575 + ... + 641016.

It is an arithmetic number, because the mean of its divisors is an integer number (14810387328).

Almost surely, 2^204121112111 is an apocalyptic number.

204121112111 is a deficient number, since it is larger than the sum of its proper divisors (32845085137).

204121112111 is an equidigital number, since it uses as much as digits as its factorization.

204121112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693262.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 204121112111 its reverse (111211121402), we get a palindrome (315332233513).

The spelling of 204121112111 in words is "two hundred four billion, one hundred twenty-one million, one hundred twelve thousand, one hundred eleven".