21283056 has 30 divisors (see below), whose sum is σ = 59563400. Its totient is φ = 7094304.

The previous prime is 21283039. The next prime is 21283091. The reversal of 21283056 is 65038212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73756 + ... + 74043.

Almost surely, 2^21283056 is an apocalyptic number.

It is an amenable number.

21283056 is an abundant number, since it is smaller than the sum of its proper divisors (38280344).

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

21283056 is a wasteful number, since it uses less digits than its factorization.

21283056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147813 (or 147804 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 21283056 is about 4613.3562619854. The cubic root of 21283056 is about 277.1264611306.

It can be divided in two parts, 2128 and 3056, that added together give a square (5184 = 72²).

The spelling of 21283056 in words is "twenty-one million, two hundred eighty-three thousand, fifty-six".