115205000121 has 24 divisors (see below), whose sum is σ = 185469354720. Its totient is φ = 68480989056.

The previous prime is 115205000117. The next prime is 115205000143. The reversal of 115205000121 is 121000502511.

115205000121 is a `hidden beast` number, since 1 + 152 + 0 + 500 + 0 + 12 + 1 = 666.

It is not a de Polignac number, because 115205000121 - 2² = 115205000117 is a prime.

It is a super-2 number, since 2×115205000121² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 115205000094 and 115205000103.

It is not an unprimeable number, because it can be changed into a prime (115205000111) 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 23 ways as a sum of consecutive naturals, for example, 19812195 + ... + 19818008.

It is an arithmetic number, because the mean of its divisors is an integer number (7727889780).

Almost surely, 2^115205000121 is an apocalyptic number.

It is an amenable number.

115205000121 is a deficient number, since it is larger than the sum of its proper divisors (70264354599).

115205000121 is a wasteful number, since it uses less digits than its factorization.

115205000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39630245 (or 39630242 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

Adding to 115205000121 its reverse (121000502511), we get a palindrome (236205502632).

The spelling of 115205000121 in words is "one hundred fifteen billion, two hundred five million, one hundred twenty-one", and thus it is an aban number.