220445213 has 4 divisors (see below), whose sum is σ = 220737180. Its totient is φ = 220153248.

The previous prime is 220445191. The next prime is 220445321. The reversal of 220445213 is 312544022.

It is a happy number.

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 124835929 + 95609284 = 11173^2 + 9778^2 .

It is a cyclic number.

It is not a de Polignac number, because 220445213 - 2⁸ = 220444957 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 (220445413) 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, 144848 + ... + 146361.

It is an arithmetic number, because the mean of its divisors is an integer number (55184295).

Almost surely, 2^220445213 is an apocalyptic number.

It is an amenable number.

220445213 is a deficient number, since it is larger than the sum of its proper divisors (291967).

220445213 is an equidigital number, since it uses as much as digits as its factorization.

220445213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291966.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 220445213 is about 14847.3975160632. The cubic root of 220445213 is about 604.0880215052.

Adding to 220445213 its reverse (312544022), we get a palindrome (532989235).

The spelling of 220445213 in words is "two hundred twenty million, four hundred forty-five thousand, two hundred thirteen".