21286848 has 56 divisors (see below), whose sum is σ = 61447680. Its totient is φ = 6449920.

The previous prime is 21286823. The next prime is 21286871. The reversal of 21286848 is 84868212.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 2928 + ... + 7151.

It is an arithmetic number, because the mean of its divisors is an integer number (1097280).

Almost surely, 2^21286848 is an apocalyptic number.

It is an amenable number.

21286848 is an abundant number, since it is smaller than the sum of its proper divisors (40160832).

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

21286848 is a wasteful number, since it uses less digits than its factorization.

21286848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10105 (or 10095 counting only the distinct ones).

The product of its digits is 49152, while the sum is 39.

The square root of 21286848 is about 4613.7672242973. The cubic root of 21286848 is about 277.1429186847.

The spelling of 21286848 in words is "twenty-one million, two hundred eighty-six thousand, eight hundred forty-eight".