2866221 has 12 divisors (see below), whose sum is σ = 4167072. Its totient is φ = 1898376.

The previous prime is 2866211. The next prime is 2866223. The reversal of 2866221 is 1226682.

It is not a de Polignac number, because 2866221 - 2⁵ = 2866189 is a prime.

2866221 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2866223) 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 11 ways as a sum of consecutive naturals, for example, 550 + ... + 2456.

It is an arithmetic number, because the mean of its divisors is an integer number (347256).

2^2866221 is an apocalyptic number.

It is an amenable number.

2866221 is a deficient number, since it is larger than the sum of its proper divisors (1300851).

2866221 is a wasteful number, since it uses less digits than its factorization.

2866221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2080 (or 2077 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 2866221 is about 1692.9917306354. The cubic root of 2866221 is about 142.0484692042.

The spelling of 2866221 in words is "two million, eight hundred sixty-six thousand, two hundred twenty-one".