21563152 has 20 divisors (see below), whose sum is σ = 44992780. Its totient is φ = 9952128.

The previous prime is 21563149. The next prime is 21563161. The reversal of 21563152 is 25136512.

It can be written as a sum of positive squares in 2 ways, for example, as 9144576 + 12418576 = 3024^2 + 3524^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51627 + ... + 52042.

It is an arithmetic number, because the mean of its divisors is an integer number (2249639).

Almost surely, 2^21563152 is an apocalyptic number.

It is an amenable number.

21563152 is an abundant number, since it is smaller than the sum of its proper divisors (23429628).

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

21563152 is a wasteful number, since it uses less digits than its factorization.

21563152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103690 (or 103684 counting only the distinct ones).

The product of its digits is 1800, while the sum is 25.

The square root of 21563152 is about 4643.6141097210. The cubic root of 21563152 is about 278.3368757443.

Adding to 21563152 its reverse (25136512), we get a palindrome (46699664).

The spelling of 21563152 in words is "twenty-one million, five hundred sixty-three thousand, one hundred fifty-two".