21823224 has 16 divisors (see below), whose sum is σ = 54558120. Its totient is φ = 7274400.

The previous prime is 21823211. The next prime is 21823247. The reversal of 21823224 is 42232812.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 909301 = 21823224 / (2 + 1 + 8 + 2 + 3 + 2 + 2 + 4).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21823194 and 21823203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454627 + ... + 454674.

Almost surely, 2^21823224 is an apocalyptic number.

21823224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21823224 is an abundant number, since it is smaller than the sum of its proper divisors (32734896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21823224 is a wasteful number, since it uses less digits than its factorization.

21823224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909310 (or 909306 counting only the distinct ones).

The product of its digits is 1536, while the sum is 24.

The square root of 21823224 is about 4671.5333671076. The cubic root of 21823224 is about 279.4514088657.

The spelling of 21823224 in words is "twenty-one million, eight hundred twenty-three thousand, two hundred twenty-four".