21563048 has 48 divisors (see below), whose sum is σ = 44963100. Its totient is φ = 9684480.

The previous prime is 21563041. The next prime is 21563051. The reversal of 21563048 is 84036512.

It can be written as a sum of positive squares in 6 ways, for example, as 14884 + 21548164 = 122^2 + 4642^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21563048.

It is not an unprimeable number, because it can be changed into a prime (21563041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55238 + ... + 55626.

Almost surely, 2^21563048 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21563048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22481550).

21563048 is an abundant number, since it is smaller than the sum of its proper divisors (23400052).

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

21563048 is a wasteful number, since it uses less digits than its factorization.

21563048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462 (or 445 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 21563048 is about 4643.6029115332. The cubic root of 21563048 is about 278.3364282667.

The spelling of 21563048 in words is "twenty-one million, five hundred sixty-three thousand, forty-eight".