2208221 has 4 divisors (see below), whose sum is σ = 2216700. Its totient is φ = 2199744.

The previous prime is 2208203. The next prime is 2208229. The reversal of 2208221 is 1228022.

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 148996 + 2059225 = 386^2 + 1435^2 .

It is a cyclic number.

It is not a de Polignac number, because 2208221 - 2¹⁰ = 2207197 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2208221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2208229) 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, 3836 + ... + 4373.

It is an arithmetic number, because the mean of its divisors is an integer number (554175).

2^2208221 is an apocalyptic number.

It is an amenable number.

2208221 is a deficient number, since it is larger than the sum of its proper divisors (8479).

2208221 is an equidigital number, since it uses as much as digits as its factorization.

2208221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8478.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 2208221 is about 1486.0084118201. The cubic root of 2208221 is about 130.2209457706.

The spelling of 2208221 in words is "two million, two hundred eight thousand, two hundred twenty-one".