220215217 has 4 divisors (see below), whose sum is σ = 220257316. Its totient is φ = 220173120.

The previous prime is 220215209. The next prime is 220215221. The reversal of 220215217 is 712512022.

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 129413376 + 90801841 = 11376^2 + 9529^2 .

It is a cyclic number.

It is not a de Polignac number, because 220215217 - 2³ = 220215209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220210217) 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, 11868 + ... + 24109.

It is an arithmetic number, because the mean of its divisors is an integer number (55064329).

Almost surely, 2^220215217 is an apocalyptic number.

It is an amenable number.

220215217 is a deficient number, since it is larger than the sum of its proper divisors (42099).

220215217 is an equidigital number, since it uses as much as digits as its factorization.

220215217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42098.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 220215217 is about 14839.6501643401. The cubic root of 220215217 is about 603.8778616899.

Adding to 220215217 its reverse (712512022), we get a palindrome (932727239).

The spelling of 220215217 in words is "two hundred twenty million, two hundred fifteen thousand, two hundred seventeen".