205504121 has 8 divisors (see below), whose sum is σ = 212750400. Its totient is φ = 198268560.

The previous prime is 205504111. The next prime is 205504127. The reversal of 205504121 is 121405502.

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 205504121 - 2¹⁰ = 205503097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205504093 and 205504102.

It is not an unprimeable number, because it can be changed into a prime (205504127) 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, 72236 + ... + 75026.

It is an arithmetic number, because the mean of its divisors is an integer number (26593800).

Almost surely, 2^205504121 is an apocalyptic number.

It is an amenable number.

205504121 is a deficient number, since it is larger than the sum of its proper divisors (7246279).

205504121 is a wasteful number, since it uses less digits than its factorization.

205504121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5359.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 205504121 is about 14335.4149224918. The cubic root of 205504121 is about 590.1197889494.

Adding to 205504121 its reverse (121405502), we get a palindrome (326909623).

The spelling of 205504121 in words is "two hundred five million, five hundred four thousand, one hundred twenty-one".