2266821 has 12 divisors (see below), whose sum is σ = 3328780. Its totient is φ = 1486080.

The previous prime is 2266801. The next prime is 2266829. The reversal of 2266821 is 1286622.

It can be written as a sum of positive squares in 2 ways, for example, as 540225 + 1726596 = 735^2 + 1314^2 .

It is not a de Polignac number, because 2266821 - 2¹⁰ = 2265797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2266829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1516 + ... + 2613.

2^2266821 is an apocalyptic number.

It is an amenable number.

2266821 is a deficient number, since it is larger than the sum of its proper divisors (1061959).

2266821 is a wasteful number, since it uses less digits than its factorization.

2266821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4196 (or 4193 counting only the distinct ones).

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

The square root of 2266821 is about 1505.5965595072. The cubic root of 2266821 is about 131.3628037026.

The spelling of 2266821 in words is "two million, two hundred sixty-six thousand, eight hundred twenty-one".