2208021 has 4 divisors (see below), whose sum is σ = 2944032. Its totient is φ = 1472012.

The previous prime is 2207993. The next prime is 2208053. The reversal of 2208021 is 1208022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2208021 - 2⁷ = 2207893 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2208061) 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, 368001 + ... + 368006.

It is an arithmetic number, because the mean of its divisors is an integer number (736008).

2^2208021 is an apocalyptic number.

It is an amenable number.

2208021 is a deficient number, since it is larger than the sum of its proper divisors (736011).

2208021 is an equidigital number, since it uses as much as digits as its factorization.

2208021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736010.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 2208021 is about 1485.9411159262. The cubic root of 2208021 is about 130.2170142536.

Subtracting from 2208021 its reverse (1208022), we obtain a palindrome (999999).

The spelling of 2208021 in words is "two million, two hundred eight thousand, twenty-one".