220205221 has 4 divisors (see below), whose sum is σ = 221323212. Its totient is φ = 219087232.

The previous prime is 220205201. The next prime is 220205239. The reversal of 220205221 is 122502022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 200081025 + 20124196 = 14145^2 + 4486^2 .

It is a cyclic number.

It is not a de Polignac number, because 220205221 - 2⁹ = 220204709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220205195 and 220205204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220205201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 558700 + ... + 559093.

It is an arithmetic number, because the mean of its divisors is an integer number (55330803).

Almost surely, 2^220205221 is an apocalyptic number.

It is an amenable number.

220205221 is a deficient number, since it is larger than the sum of its proper divisors (1117991).

220205221 is a wasteful number, since it uses less digits than its factorization.

220205221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117990.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 220205221 is about 14839.3133601255. The cubic root of 220205221 is about 603.8687244854.

Adding to 220205221 its reverse (122502022), we get a palindrome (342707243).

The spelling of 220205221 in words is "two hundred twenty million, two hundred five thousand, two hundred twenty-one".