205554514121 has 8 divisors (see below), whose sum is σ = 224250513984. Its totient is φ = 186860051920.

The previous prime is 205554514117. The next prime is 205554514159. The reversal of 205554514121 is 121415455502.

205554514121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 205554514121 - 2² = 205554514117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205554514181) 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 7 ways as a sum of consecutive naturals, for example, 95450 + ... + 648243.

It is an arithmetic number, because the mean of its divisors is an integer number (28031314248).

Almost surely, 2^205554514121 is an apocalyptic number.

It is an amenable number.

205554514121 is a deficient number, since it is larger than the sum of its proper divisors (18695999863).

205554514121 is a wasteful number, since it uses less digits than its factorization.

205554514121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768831.

The product of its (nonzero) digits is 40000, while the sum is 35.

Adding to 205554514121 its reverse (121415455502), we get a palindrome (326969969623).

The spelling of 205554514121 in words is "two hundred five billion, five hundred fifty-four million, five hundred fourteen thousand, one hundred twenty-one".