2805221 has 8 divisors (see below), whose sum is σ = 3066624. Its totient is φ = 2554560.

The previous prime is 2805203. The next prime is 2805227. The reversal of 2805221 is 1225082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2805221 - 2⁶ = 2805157 is a prime.

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 = 2805193 and 2805202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2805227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2135 + ... + 3188.

It is an arithmetic number, because the mean of its divisors is an integer number (383328).

2^2805221 is an apocalyptic number.

It is an amenable number.

2805221 is a deficient number, since it is larger than the sum of its proper divisors (261403).

2805221 is a wasteful number, since it uses less digits than its factorization.

2805221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5371.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 2805221 is about 1674.8793986434. The cubic root of 2805221 is about 141.0335248821.

The spelling of 2805221 in words is "two million, eight hundred five thousand, two hundred twenty-one".