2205921 has 4 divisors (see below), whose sum is σ = 2941232. Its totient is φ = 1470612.

The previous prime is 2205911. The next prime is 2205947. The reversal of 2205921 is 1295022.

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 not a de Polignac number, because 2205921 - 2⁷ = 2205793 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2205911) 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, 367651 + ... + 367656.

It is an arithmetic number, because the mean of its divisors is an integer number (735308).

2^2205921 is an apocalyptic number.

It is an amenable number.

2205921 is a deficient number, since it is larger than the sum of its proper divisors (735311).

2205921 is an equidigital number, since it uses as much as digits as its factorization.

2205921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735310.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 2205921 is about 1485.2343249467. The cubic root of 2205921 is about 130.1757189839.

The spelling of 2205921 in words is "two million, two hundred five thousand, nine hundred twenty-one".