8816921 has 4 divisors (see below), whose sum is σ = 8983332. Its totient is φ = 8650512.

The previous prime is 8816917. The next prime is 8816933. The reversal of 8816921 is 1296188.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7639696 + 1177225 = 2764^2 + 1085^2 .

It is a cyclic number.

It is not a de Polignac number, because 8816921 - 2² = 8816917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8816911) 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, 83126 + ... + 83231.

It is an arithmetic number, because the mean of its divisors is an integer number (2245833).

Almost surely, 2^8816921 is an apocalyptic number.

It is an amenable number.

8816921 is a deficient number, since it is larger than the sum of its proper divisors (166411).

8816921 is a wasteful number, since it uses less digits than its factorization.

8816921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166410.

The product of its digits is 6912, while the sum is 35.

The square root of 8816921 is about 2969.3300591211. The cubic root of 8816921 is about 206.5882657293.

The spelling of 8816921 in words is "eight million, eight hundred sixteen thousand, nine hundred twenty-one".