204106661121 has 16 divisors (see below), whose sum is σ = 296922928320. Its totient is φ = 123684126720.

The previous prime is 204106661051. The next prime is 204106661153. The reversal of 204106661121 is 121166601402.

204106661121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 204106661121 - 2⁹ = 204106660609 is a prime.

It is a super-2 number, since 2×204106661121² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (204106661191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174336 + ... + 662273.

It is an arithmetic number, because the mean of its divisors is an integer number (18557683020).

Almost surely, 2^204106661121 is an apocalyptic number.

It is an amenable number.

204106661121 is a deficient number, since it is larger than the sum of its proper divisors (92816267199).

204106661121 is a wasteful number, since it uses less digits than its factorization.

204106661121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844016.

The product of its (nonzero) digits is 3456, while the sum is 30.

The spelling of 204106661121 in words is "two hundred four billion, one hundred six million, six hundred sixty-one thousand, one hundred twenty-one".