21823268 has 12 divisors (see below), whose sum is σ = 38240412. Its totient is φ = 10897440.

The previous prime is 21823261. The next prime is 21823271. The reversal of 21823268 is 86232812.

It can be written as a sum of positive squares in 2 ways, for example, as 8631844 + 13191424 = 2938^2 + 3632^2 .

It is not an unprimeable number, because it can be changed into a prime (21823261) 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, 398 + ... + 6618.

It is an arithmetic number, because the mean of its divisors is an integer number (3186701).

Almost surely, 2^21823268 is an apocalyptic number.

It is an amenable number.

21823268 is a deficient number, since it is larger than the sum of its proper divisors (16417144).

21823268 is a wasteful number, since it uses less digits than its factorization.

21823268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7102 (or 7100 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 21823268 is about 4671.5380764797. The cubic root of 21823268 is about 279.4515966757.

The spelling of 21823268 in words is "twenty-one million, eight hundred twenty-three thousand, two hundred sixty-eight".