21104324 has 12 divisors (see below), whose sum is σ = 37453248. Its totient is φ = 10403400.

The previous prime is 21104323. The next prime is 21104329. The reversal of 21104324 is 42340112.

It is not an unprimeable number, because it can be changed into a prime (21104323) 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, 36872 + ... + 37439.

It is an arithmetic number, because the mean of its divisors is an integer number (3121104).

Almost surely, 2^21104324 is an apocalyptic number.

It is an amenable number.

21104324 is a deficient number, since it is larger than the sum of its proper divisors (16348924).

21104324 is a wasteful number, since it uses less digits than its factorization.

21104324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74386 (or 74384 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21104324 is about 4593.9442748035. The cubic root of 21104324 is about 276.3485235141.

Adding to 21104324 its reverse (42340112), we get a palindrome (63444436).

The spelling of 21104324 in words is "twenty-one million, one hundred four thousand, three hundred twenty-four".