21239104 has 28 divisors (see below), whose sum is σ = 42332148. Its totient is φ = 10572800.

The previous prime is 21239087. The next prime is 21239173. The reversal of 21239104 is 40193212.

It can be written as a sum of positive squares in 2 ways, for example, as 17239104 + 4000000 = 4152^2 + 2000^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17394 + ... + 18574.

Almost surely, 2^21239104 is an apocalyptic number.

It is an amenable number.

21239104 is a deficient number, since it is larger than the sum of its proper divisors (21093044).

21239104 is a wasteful number, since it uses less digits than its factorization.

21239104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474 (or 1464 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 21239104 is about 4608.5902399758. The cubic root of 21239104 is about 276.9355634762.

The spelling of 21239104 in words is "twenty-one million, two hundred thirty-nine thousand, one hundred four".