220020221 has 4 divisors (see below), whose sum is σ = 220085244. Its totient is φ = 219955200.

The previous prime is 220020217. The next prime is 220020233. The reversal of 220020221 is 122020022.

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 149695225 + 70324996 = 12235^2 + 8386^2 .

It is a cyclic number.

It is not a de Polignac number, because 220020221 - 2² = 220020217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220020421) 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 3 ways as a sum of consecutive naturals, for example, 27140 + ... + 34301.

It is an arithmetic number, because the mean of its divisors is an integer number (55021311).

Almost surely, 2^220020221 is an apocalyptic number.

It is an amenable number.

220020221 is a deficient number, since it is larger than the sum of its proper divisors (65023).

220020221 is an equidigital number, since it uses as much as digits as its factorization.

220020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65022.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 220020221 is about 14833.0786082998. The cubic root of 220020221 is about 603.6995686207.

Adding to 220020221 its reverse (122020022), we get a palindrome (342040243).

The spelling of 220020221 in words is "two hundred twenty million, twenty thousand, two hundred twenty-one".