2205221705 has 4 divisors (see below), whose sum is σ = 2646266052. Its totient is φ = 1764177360.

The previous prime is 2205221699. The next prime is 2205221713. The reversal of 2205221705 is 5071225022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5071225022 = 2 ⋅2535612511.

It can be written as a sum of positive squares in 2 ways, for example, as 231374521 + 1973847184 = 15211^2 + 44428^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2205221705 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220522166 + ... + 220522175.

It is an arithmetic number, because the mean of its divisors is an integer number (661566513).

Almost surely, 2^2205221705 is an apocalyptic number.

It is an amenable number.

2205221705 is a deficient number, since it is larger than the sum of its proper divisors (441044347).

2205221705 is an equidigital number, since it uses as much as digits as its factorization.

2205221705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441044346.

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

The square root of 2205221705 is about 46959.7881703059. The cubic root of 2205221705 is about 1301.6196194083.

Adding to 2205221705 its reverse (5071225022), we get a palindrome (7276446727).

The spelling of 2205221705 in words is "two billion, two hundred five million, two hundred twenty-one thousand, seven hundred five".