205110221 has 4 divisors (see below), whose sum is σ = 205407744. Its totient is φ = 204812700.

The previous prime is 205110211. The next prime is 205110223. The reversal of 205110221 is 122011502.

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 a de Polignac number, because none of the positive numbers 2^k-205110221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205110196 and 205110205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205110223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147725 + ... + 149106.

It is an arithmetic number, because the mean of its divisors is an integer number (51351936).

Almost surely, 2^205110221 is an apocalyptic number.

It is an amenable number.

205110221 is a deficient number, since it is larger than the sum of its proper divisors (297523).

205110221 is an equidigital number, since it uses as much as digits as its factorization.

205110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297522.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 205110221 is about 14321.6696303189. The cubic root of 205110221 is about 589.7425104515.

Adding to 205110221 its reverse (122011502), we get a palindrome (327121723).

The spelling of 205110221 in words is "two hundred five million, one hundred ten thousand, two hundred twenty-one".