21239044 has 12 divisors (see below), whose sum is σ = 37248064. Its totient is φ = 10596744.

The previous prime is 21239039. The next prime is 21239059. The reversal of 21239044 is 44093212.

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, 3504 + ... + 7399.

Almost surely, 2^21239044 is an apocalyptic number.

It is an amenable number.

21239044 is a deficient number, since it is larger than the sum of its proper divisors (16009020).

21239044 is a wasteful number, since it uses less digits than its factorization.

21239044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11394 (or 11392 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 21239044 is about 4608.5837303883. The cubic root of 21239044 is about 276.9353026970.

The spelling of 21239044 in words is "twenty-one million, two hundred thirty-nine thousand, forty-four".