21044024 has 32 divisors (see below), whose sum is σ = 41515200. Its totient is φ = 9985920.

The previous prime is 21044003. The next prime is 21044047. The reversal of 21044024 is 42044012.

It is a super-2 number, since 2×21044024² = 885701892225152, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21043993 and 21044011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13409 + ... + 14895.

It is an arithmetic number, because the mean of its divisors is an integer number (1297350).

Almost surely, 2^21044024 is an apocalyptic number.

It is an amenable number.

21044024 is a deficient number, since it is larger than the sum of its proper divisors (20471176).

21044024 is a wasteful number, since it uses less digits than its factorization.

21044024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583 (or 1579 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 21044024 is about 4587.3765923456. The cubic root of 21044024 is about 276.0850749428.

Adding to 21044024 its reverse (42044012), we get a palindrome (63088036).

The spelling of 21044024 in words is "twenty-one million, forty-four thousand, twenty-four".