21868323 has 4 divisors (see below), whose sum is σ = 29157768. Its totient is φ = 14578880.

The previous prime is 21868321. The next prime is 21868333. The reversal of 21868323 is 32386812.

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

It is a cyclic number.

It is not a de Polignac number, because 21868323 - 2¹ = 21868321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21868321) 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, 3644718 + ... + 3644723.

It is an arithmetic number, because the mean of its divisors is an integer number (7289442).

Almost surely, 2^21868323 is an apocalyptic number.

21868323 is a deficient number, since it is larger than the sum of its proper divisors (7289445).

21868323 is an equidigital number, since it uses as much as digits as its factorization.

21868323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7289444.

The product of its digits is 13824, while the sum is 33.

The square root of 21868323 is about 4676.3578776651. The cubic root of 21868323 is about 279.6437774397.

The spelling of 21868323 in words is "twenty-one million, eight hundred sixty-eight thousand, three hundred twenty-three".