2204921 has 4 divisors (see below), whose sum is σ = 2226432. Its totient is φ = 2183412.

The previous prime is 2204887. The next prime is 2204929. The reversal of 2204921 is 1294022.

2204921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1294022 = 2 ⋅647011.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2204921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2204893 and 2204902.

It is not an unprimeable number, because it can be changed into a prime (2204929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10601 + ... + 10806.

It is an arithmetic number, because the mean of its divisors is an integer number (556608).

2^2204921 is an apocalyptic number.

It is an amenable number.

2204921 is a deficient number, since it is larger than the sum of its proper divisors (21511).

2204921 is a wasteful number, since it uses less digits than its factorization.

2204921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21510.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 2204921 is about 1484.8976395698. The cubic root of 2204921 is about 130.1560453578.

Adding to 2204921 its reverse (1294022), we get a palindrome (3498943).

It can be divided in two parts, 2204 and 921, that added together give a 5-th power (3125 = 5⁵).

The spelling of 2204921 in words is "two million, two hundred four thousand, nine hundred twenty-one".