2800221 has 4 divisors (see below), whose sum is σ = 3733632. Its totient is φ = 1866812.

The previous prime is 2800219. The next prime is 2800241. The reversal of 2800221 is 1220082.

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 2800221 - 2¹ = 2800219 is a prime.

It is a D-number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2800221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2800241) 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 3 ways as a sum of consecutive naturals, for example, 466701 + ... + 466706.

It is an arithmetic number, because the mean of its divisors is an integer number (933408).

2^2800221 is an apocalyptic number.

It is an amenable number.

2800221 is a deficient number, since it is larger than the sum of its proper divisors (933411).

2800221 is an equidigital number, since it uses as much as digits as its factorization.

2800221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933410.

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

The square root of 2800221 is about 1673.3860881458. The cubic root of 2800221 is about 140.9496827652.

The spelling of 2800221 in words is "two million, eight hundred thousand, two hundred twenty-one".