205254143121 has 16 divisors (see below), whose sum is σ = 282626785280. Its totient is φ = 132362750160.

The previous prime is 205254143099. The next prime is 205254143147. The reversal of 205254143121 is 121341452502.

205254143121 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 205254143121 - 2⁷ = 205254142993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205254143321) 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, 284635 + ... + 701088.

It is an arithmetic number, because the mean of its divisors is an integer number (17664174080).

Almost surely, 2^205254143121 is an apocalyptic number.

It is an amenable number.

205254143121 is a deficient number, since it is larger than the sum of its proper divisors (77372642159).

205254143121 is a wasteful number, since it uses less digits than its factorization.

205254143121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 987996.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 205254143121 its reverse (121341452502), we get a palindrome (326595595623).

The spelling of 205254143121 in words is "two hundred five billion, two hundred fifty-four million, one hundred forty-three thousand, one hundred twenty-one".