21248944 has 20 divisors (see below), whose sum is σ = 41311096. Its totient is φ = 10588032.

The previous prime is 21248921. The next prime is 21248957. The reversal of 21248944 is 44984212.

It is a super-2 number, since 2×21248944² = 903035242230272, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2887 + ... + 7129.

Almost surely, 2^21248944 is an apocalyptic number.

It is an amenable number.

21248944 is a deficient number, since it is larger than the sum of its proper divisors (20062152).

21248944 is a wasteful number, since it uses less digits than its factorization.

21248944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4564 (or 4558 counting only the distinct ones).

The product of its digits is 18432, while the sum is 34.

The square root of 21248944 is about 4609.6576879417. The cubic root of 21248944 is about 276.9783246212.

The spelling of 21248944 in words is "twenty-one million, two hundred forty-eight thousand, nine hundred forty-four".