21104443 has 8 divisors (see below), whose sum is σ = 21727728. Its totient is φ = 20487264.

The previous prime is 21104407. The next prime is 21104453. The reversal of 21104443 is 34440112.

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

It is not a de Polignac number, because 21104443 - 2¹⁷ = 20973371 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21104443.

It is not an unprimeable number, because it can be changed into a prime (21104453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6021 + ... + 8857.

It is an arithmetic number, because the mean of its divisors is an integer number (2715966).

Almost surely, 2^21104443 is an apocalyptic number.

21104443 is a deficient number, since it is larger than the sum of its proper divisors (623285).

21104443 is a wasteful number, since it uses less digits than its factorization.

21104443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3053.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 21104443 is about 4593.9572266185. The cubic root of 21104443 is about 276.3490429244.

Adding to 21104443 its reverse (34440112), we get a palindrome (55544555).

The spelling of 21104443 in words is "twenty-one million, one hundred four thousand, four hundred forty-three".