21104704 has 14 divisors (see below), whose sum is σ = 41879774. Its totient is φ = 10552320.

The previous prime is 21104693. The next prime is 21104711. The reversal of 21104704 is 40740112.

It can be written as a sum of positive squares in only one way, i.e., 12390400 + 8714304 = 3520^2 + 2952^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164817 + ... + 164944.

Almost surely, 2^21104704 is an apocalyptic number.

It is an amenable number.

21104704 is a deficient number, since it is larger than the sum of its proper divisors (20775070).

21104704 is an equidigital number, since it uses as much as digits as its factorization.

21104704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329773 (or 329763 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 21104704 is about 4593.9856334125. The cubic root of 21104704 is about 276.3501821285.

Adding to 21104704 its reverse (40740112), we get a palindrome (61844816).

The spelling of 21104704 in words is "twenty-one million, one hundred four thousand, seven hundred four".