205121355 has 8 divisors (see below), whose sum is σ = 328194192. Its totient is φ = 109398048.

The previous prime is 205121333. The next prime is 205121363. The reversal of 205121355 is 553121502.

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 205121355 - 2⁷ = 205121227 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6837364 + ... + 6837393.

It is an arithmetic number, because the mean of its divisors is an integer number (41024274).

Almost surely, 2^205121355 is an apocalyptic number.

205121355 is a deficient number, since it is larger than the sum of its proper divisors (123072837).

205121355 is a wasteful number, since it uses less digits than its factorization.

205121355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13674765.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 205121355 is about 14322.0583367057. The cubic root of 205121355 is about 589.7531812578.

Adding to 205121355 its reverse (553121502), we get a palindrome (758242857).

The spelling of 205121355 in words is "two hundred five million, one hundred twenty-one thousand, three hundred fifty-five".