21236048 has 20 divisors (see below), whose sum is σ = 41643168. Its totient is φ = 10489440.

The previous prime is 21236041. The next prime is 21236063. The reversal of 21236048 is 84063212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21236041) by changing a digit.

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, 6668 + ... + 9323.

Almost surely, 2^21236048 is an apocalyptic number.

It is an amenable number.

21236048 is a deficient number, since it is larger than the sum of its proper divisors (20407120).

21236048 is a wasteful number, since it uses less digits than its factorization.

21236048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16082 (or 16076 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 21236048 is about 4608.2586732952. The cubic root of 21236048 is about 276.9222804979.

The spelling of 21236048 in words is "twenty-one million, two hundred thirty-six thousand, forty-eight".