21248624 has 20 divisors (see below), whose sum is σ = 41497344. Its totient is φ = 10539648.

The previous prime is 21248599. The next prime is 21248639. The reversal of 21248624 is 42684212.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3197 + ... + 7260.

Almost surely, 2^21248624 is an apocalyptic number.

It is an amenable number.

21248624 is a deficient number, since it is larger than the sum of its proper divisors (20248720).

21248624 is a wasteful number, since it uses less digits than its factorization.

21248624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10592 (or 10586 counting only the distinct ones).

The product of its digits is 6144, while the sum is 29.

The square root of 21248624 is about 4609.6229780753. The cubic root of 21248624 is about 276.9769342226.

The spelling of 21248624 in words is "twenty-one million, two hundred forty-eight thousand, six hundred twenty-four".