21424504 has 16 divisors (see below), whose sum is σ = 41556600. Its totient is φ = 10342752.

The previous prime is 21424499. The next prime is 21424511. The reversal of 21424504 is 40542412.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45942 + ... + 46405.

Almost surely, 2^21424504 is an apocalyptic number.

It is an amenable number.

21424504 is a deficient number, since it is larger than the sum of its proper divisors (20132096).

21424504 is a wasteful number, since it uses less digits than its factorization.

21424504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92382 (or 92378 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 21424504 is about 4628.6611455150. The cubic root of 21424504 is about 277.7390370624.

Adding to 21424504 its reverse (40542412), we get a palindrome (61966916).

The spelling of 21424504 in words is "twenty-one million, four hundred twenty-four thousand, five hundred four".