21248336 has 20 divisors (see below), whose sum is σ = 41947092. Its totient is φ = 10423296.

The previous prime is 21248309. The next prime is 21248363. The reversal of 21248336 is 63384212.

It is an interprime number because it is at equal distance from previous prime (21248309) and next prime (21248363).

It can be written as a sum of positive squares in 2 ways, for example, as 9985600 + 11262736 = 3160^2 + 3356^2 .

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 junction number, because it is equal to n+sod(n) for n = 21248299 and 21248308.

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, 11681 + ... + 13376.

Almost surely, 2^21248336 is an apocalyptic number.

It is an amenable number.

21248336 is a deficient number, since it is larger than the sum of its proper divisors (20698756).

21248336 is a wasteful number, since it uses less digits than its factorization.

21248336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25118 (or 25112 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 21248336 is about 4609.5917389721. The cubic root of 21248336 is about 276.9756828519.

The spelling of 21248336 in words is "twenty-one million, two hundred forty-eight thousand, three hundred thirty-six".