21869248 has 28 divisors (see below), whose sum is σ = 44897040. Its totient is φ = 10556672.

The previous prime is 21869233. The next prime is 21869249. The reversal of 21869248 is 84296812.

It is a self number, because there is not a number n which added to its sum of digits gives 21869248.

It is not an unprimeable number, because it can be changed into a prime (21869249) by changing a digit.

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, 4036 + ... + 7747.

Almost surely, 2^21869248 is an apocalyptic number.

It is an amenable number.

21869248 is an abundant number, since it is smaller than the sum of its proper divisors (23027792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21869248 is a wasteful number, since it uses less digits than its factorization.

21869248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11824 (or 11814 counting only the distinct ones).

The product of its digits is 55296, while the sum is 40.

The square root of 21869248 is about 4676.4567783740. The cubic root of 21869248 is about 279.6477202332.

The spelling of 21869248 in words is "twenty-one million, eight hundred sixty-nine thousand, two hundred forty-eight".