21823893 has 24 divisors (see below), whose sum is σ = 38799488. Its totient is φ = 11511072.

The previous prime is 21823891. The next prime is 21823897. The reversal of 21823893 is 39832812.

It is a happy number.

It is not a de Polignac number, because 21823893 - 2¹ = 21823891 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21823891) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12505 + ... + 14142.

Almost surely, 2^21823893 is an apocalyptic number.

It is an amenable number.

21823893 is a deficient number, since it is larger than the sum of its proper divisors (16975595).

21823893 is a wasteful number, since it uses less digits than its factorization.

21823893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26673 (or 26670 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 21823893 is about 4671.6049704572. The cubic root of 21823893 is about 279.4542644029.

The spelling of 21823893 in words is "twenty-one million, eight hundred twenty-three thousand, eight hundred ninety-three".