205116122121 has 8 divisors (see below), whose sum is σ = 274350902784. Its totient is φ = 136312711440.

The previous prime is 205116122077. The next prime is 205116122129. The reversal of 205116122121 is 121221611502.

It is a happy number.

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

It is not a de Polignac number, because 205116122121 - 2¹³ = 205116113929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205116122091 and 205116122100.

It is not an unprimeable number, because it can be changed into a prime (205116122129) 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, 107841385 + ... + 107843286.

It is an arithmetic number, because the mean of its divisors is an integer number (34293862848).

Almost surely, 2^205116122121 is an apocalyptic number.

It is an amenable number.

205116122121 is a deficient number, since it is larger than the sum of its proper divisors (69234780663).

205116122121 is a wasteful number, since it uses less digits than its factorization.

205116122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215684991.

The product of its (nonzero) digits is 480, while the sum is 24.

Adding to 205116122121 its reverse (121221611502), we get a palindrome (326337733623).

The spelling of 205116122121 in words is "two hundred five billion, one hundred sixteen million, one hundred twenty-two thousand, one hundred twenty-one".