21104043 has 4 divisors (see below), whose sum is σ = 28138728. Its totient is φ = 14069360.

The previous prime is 21104033. The next prime is 21104059. The reversal of 21104043 is 34040112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21104043 - 2⁵ = 21104011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21104033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3517338 + ... + 3517343.

It is an arithmetic number, because the mean of its divisors is an integer number (7034682).

Almost surely, 2^21104043 is an apocalyptic number.

21104043 is a deficient number, since it is larger than the sum of its proper divisors (7034685).

21104043 is an equidigital number, since it uses as much as digits as its factorization.

21104043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7034684.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21104043 is about 4593.9136909611. The cubic root of 21104043 is about 276.3472969996.

Adding to 21104043 its reverse (34040112), we get a palindrome (55144155).

The spelling of 21104043 in words is "twenty-one million, one hundred four thousand, forty-three".