205046221 has 4 divisors (see below), whose sum is σ = 205714432. Its totient is φ = 204378012.

The previous prime is 205046209. The next prime is 205046227. The reversal of 205046221 is 122640502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 205046221 - 2¹¹ = 205044173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205046192 and 205046201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205046227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333645 + ... + 334258.

It is an arithmetic number, because the mean of its divisors is an integer number (51428608).

Almost surely, 2^205046221 is an apocalyptic number.

It is an amenable number.

205046221 is a deficient number, since it is larger than the sum of its proper divisors (668211).

205046221 is an equidigital number, since it uses as much as digits as its factorization.

205046221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668210.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 205046221 is about 14319.4350796391. The cubic root of 205046221 is about 589.6811654719.

Adding to 205046221 its reverse (122640502), we get a palindrome (327686723).

The spelling of 205046221 in words is "two hundred five million, forty-six thousand, two hundred twenty-one".