21248672 has 24 divisors (see below), whose sum is σ = 41953716. Its totient is φ = 10593792.

The previous prime is 21248663. The next prime is 21248687. The reversal of 21248672 is 27684212.

It can be written as a sum of positive squares in 2 ways, for example, as 16032016 + 5216656 = 4004^2 + 2284^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

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, 13898 + ... + 15350.

Almost surely, 2^21248672 is an apocalyptic number.

It is an amenable number.

21248672 is a deficient number, since it is larger than the sum of its proper divisors (20705044).

21248672 is a wasteful number, since it uses less digits than its factorization.

21248672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920 (or 1912 counting only the distinct ones).

The product of its digits is 10752, while the sum is 32.

The square root of 21248672 is about 4609.6281845719. The cubic root of 21248672 is about 276.9771427833.

It can be divided in two parts, 212 and 48672, that added together give a palindrome (48884).

The spelling of 21248672 in words is "twenty-one million, two hundred forty-eight thousand, six hundred seventy-two".