21327224 has 16 divisors (see below), whose sum is σ = 40056120. Its totient is φ = 10645600.

The previous prime is 21327223. The next prime is 21327227. The reversal of 21327224 is 42272312.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21327224.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21327221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3707 + ... + 7509.

Almost surely, 2^21327224 is an apocalyptic number.

It is an amenable number.

21327224 is a deficient number, since it is larger than the sum of its proper divisors (18728896).

21327224 is a wasteful number, since it uses less digits than its factorization.

21327224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4510 (or 4506 counting only the distinct ones).

The product of its digits is 1344, while the sum is 23.

The square root of 21327224 is about 4618.1407514280. The cubic root of 21327224 is about 277.3180323679.

Adding to 21327224 its reverse (42272312), we get a palindrome (63599536).

The spelling of 21327224 in words is "twenty-one million, three hundred twenty-seven thousand, two hundred twenty-four".