2005221 has 4 divisors (see below), whose sum is σ = 2673632. Its totient is φ = 1336812.

The previous prime is 2005207. The next prime is 2005229. The reversal of 2005221 is 1225002.

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 2005221 - 2⁵ = 2005189 is a prime.

It is a super-2 number, since 2×2005221² = 8041822517682, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2005197 and 2005206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005229) 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, 334201 + ... + 334206.

It is an arithmetic number, because the mean of its divisors is an integer number (668408).

2^2005221 is an apocalyptic number.

It is an amenable number.

2005221 is a deficient number, since it is larger than the sum of its proper divisors (668411).

2005221 is an equidigital number, since it uses as much as digits as its factorization.

2005221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668410.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 2005221 is about 1416.0582615133. The cubic root of 2005221 is about 126.1016438577.

The spelling of 2005221 in words is "two million, five thousand, two hundred twenty-one".