21824332 has 24 divisors (see below), whose sum is σ = 40142592. Its totient is φ = 10362000.

The previous prime is 21824329. The next prime is 21824353. The reversal of 21824332 is 23342812.

It is a junction number, because it is equal to n+sod(n) for n = 21824297 and 21824306.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13107 + ... + 14677.

It is an arithmetic number, because the mean of its divisors is an integer number (1672608).

Almost surely, 2^21824332 is an apocalyptic number.

It is an amenable number.

21824332 is a deficient number, since it is larger than the sum of its proper divisors (18318260).

21824332 is a wasteful number, since it uses less digits than its factorization.

21824332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749 (or 1747 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

The square root of 21824332 is about 4671.6519562142. The cubic root of 21824332 is about 279.4561381841.

The spelling of 21824332 in words is "twenty-one million, eight hundred twenty-four thousand, three hundred thirty-two".