2208600221 has 4 divisors (see below), whose sum is σ = 2244806844. Its totient is φ = 2172393600.

The previous prime is 2208600209. The next prime is 2208600227. The reversal of 2208600221 is 1220068022.

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 1024896196 + 1183704025 = 32014^2 + 34405^2 .

It is a cyclic number.

It is not a de Polignac number, because 2208600221 - 2¹⁴ = 2208583837 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 (2208600227) 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, 18103220 + ... + 18103341.

It is an arithmetic number, because the mean of its divisors is an integer number (561201711).

Almost surely, 2^2208600221 is an apocalyptic number.

It is an amenable number.

2208600221 is a deficient number, since it is larger than the sum of its proper divisors (36206623).

2208600221 is an equidigital number, since it uses as much as digits as its factorization.

2208600221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36206622.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 2208600221 is about 46995.7468394747. The cubic root of 2208600221 is about 1302.2839968802.

Adding to 2208600221 its reverse (1220068022), we get a palindrome (3428668243).

The spelling of 2208600221 in words is "two billion, two hundred eight million, six hundred thousand, two hundred twenty-one".