220310221 has 4 divisors (see below), whose sum is σ = 220352572. Its totient is φ = 220267872.

The previous prime is 220310219. The next prime is 220310243. The reversal of 220310221 is 122013022.

220310221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 191268900 + 29041321 = 13830^2 + 5389^2 .

It is a cyclic number.

It is not a de Polignac number, because 220310221 - 2¹ = 220310219 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 (220310821) 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, 12066 + ... + 24211.

It is an arithmetic number, because the mean of its divisors is an integer number (55088143).

Almost surely, 2^220310221 is an apocalyptic number.

It is an amenable number.

220310221 is a deficient number, since it is larger than the sum of its proper divisors (42351).

220310221 is an equidigital number, since it uses as much as digits as its factorization.

220310221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42350.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 220310221 is about 14842.8508380297. The cubic root of 220310221 is about 603.9646897256.

Adding to 220310221 its reverse (122013022), we get a palindrome (342323243).

The spelling of 220310221 in words is "two hundred twenty million, three hundred ten thousand, two hundred twenty-one".