204121112109 has 8 divisors (see below), whose sum is σ = 272476852992. Its totient is φ = 135923056320.

The previous prime is 204121112087. The next prime is 204121112119. The reversal of 204121112109 is 901211121402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 204121112109 - 2¹⁶ = 204121046573 is a prime.

It is a super-2 number, since 2×204121112109² (a number of 23 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 39418252 + ... + 39423429.

It is an arithmetic number, because the mean of its divisors is an integer number (34059606624).

Almost surely, 2^204121112109 is an apocalyptic number.

It is an amenable number.

204121112109 is a deficient number, since it is larger than the sum of its proper divisors (68355740883).

204121112109 is an equidigital number, since it uses as much as digits as its factorization.

204121112109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78842547.

The product of its (nonzero) digits is 288, while the sum is 24.

The spelling of 204121112109 in words is "two hundred four billion, one hundred twenty-one million, one hundred twelve thousand, one hundred nine".