21104363 has 16 divisors (see below), whose sum is σ = 25712640. Its totient is φ = 16928736.

The previous prime is 21104341. The next prime is 21104389. The reversal of 21104363 is 36340112.

It is not a de Polignac number, because 21104363 - 2¹⁰ = 21103339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21104323) 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 15 ways as a sum of consecutive naturals, for example, 6173 + ... + 8961.

It is an arithmetic number, because the mean of its divisors is an integer number (1607040).

Almost surely, 2^21104363 is an apocalyptic number.

21104363 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21104363 is a deficient number, since it is larger than the sum of its proper divisors (4608277).

21104363 is a wasteful number, since it uses less digits than its factorization.

21104363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2866.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 21104363 is about 4593.9485195200. The cubic root of 21104363 is about 276.3486937412.

Adding to 21104363 its reverse (36340112), we get a palindrome (57444475).

The spelling of 21104363 in words is "twenty-one million, one hundred four thousand, three hundred sixty-three".