2205520217 has 4 divisors (see below), whose sum is σ = 2247133860. Its totient is φ = 2163906576.

The previous prime is 2205520169. The next prime is 2205520223. The reversal of 2205520217 is 7120255022.

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 1092897481 + 1112622736 = 33059^2 + 33356^2 .

It is a cyclic number.

It is not a de Polignac number, because 2205520217 - 2⁶ = 2205520153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2205523217) 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, 20806742 + ... + 20806847.

It is an arithmetic number, because the mean of its divisors is an integer number (561783465).

Almost surely, 2^2205520217 is an apocalyptic number.

It is an amenable number.

2205520217 is a deficient number, since it is larger than the sum of its proper divisors (41613643).

2205520217 is an equidigital number, since it uses as much as digits as its factorization.

2205520217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41613642.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 2205520217 is about 46962.9664416549. The cubic root of 2205520217 is about 1301.6783484307.

Adding to 2205520217 its reverse (7120255022), we get a palindrome (9325775239).

The spelling of 2205520217 in words is "two billion, two hundred five million, five hundred twenty thousand, two hundred seventeen".