21240848 has 20 divisors (see below), whose sum is σ = 41308368. Its totient is φ = 10580640.

The previous prime is 21240833. The next prime is 21240881. The reversal of 21240848 is 84804212.

It is a self number, because there is not a number n which added to its sum of digits gives 21240848.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2183 + ... + 6873.

Almost surely, 2^21240848 is an apocalyptic number.

It is an amenable number.

21240848 is a deficient number, since it is larger than the sum of its proper divisors (20067520).

21240848 is a wasteful number, since it uses less digits than its factorization.

21240848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4982 (or 4976 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 29.

The square root of 21240848 is about 4608.7794479667. The cubic root of 21240848 is about 276.9431432436.

The spelling of 21240848 in words is "twenty-one million, two hundred forty thousand, eight hundred forty-eight".