21563248 has 20 divisors (see below), whose sum is σ = 47747440. Its totient is φ = 9241344.

The previous prime is 21563237. The next prime is 21563249. The reversal of 21563248 is 84236512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21563249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96153 + ... + 96376.

It is an arithmetic number, because the mean of its divisors is an integer number (2387372).

Almost surely, 2^21563248 is an apocalyptic number.

21563248 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21563248 is an abundant number, since it is smaller than the sum of its proper divisors (26184192).

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

21563248 is a wasteful number, since it uses less digits than its factorization.

21563248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192544 (or 192538 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 21563248 is about 4643.6244464857. The cubic root of 21563248 is about 278.3372887992.

The spelling of 21563248 in words is "twenty-one million, five hundred sixty-three thousand, two hundred forty-eight".