21984443 has 8 divisors (see below), whose sum is σ = 23730000. Its totient is φ = 20246688.

The previous prime is 21984421. The next prime is 21984449. The reversal of 21984443 is 34448912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21984443 - 2⁸ = 21984187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21984449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4793 + ... + 8181.

It is an arithmetic number, because the mean of its divisors is an integer number (2966250).

Almost surely, 2^21984443 is an apocalyptic number.

21984443 is a deficient number, since it is larger than the sum of its proper divisors (1745557).

21984443 is a wasteful number, since it uses less digits than its factorization.

21984443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3901.

The product of its digits is 27648, while the sum is 35.

The square root of 21984443 is about 4688.7570847720. The cubic root of 21984443 is about 280.1378700278.

The spelling of 21984443 in words is "twenty-one million, nine hundred eighty-four thousand, four hundred forty-three".