21560448 has 128 divisors (see below), whose sum is σ = 70600320. Its totient is φ = 5677056.

The previous prime is 21560431. The next prime is 21560467. The reversal of 21560448 is 84406512.

It is a tau number, because it is divible by the number of its divisors (128).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34636 + ... + 35252.

It is an arithmetic number, because the mean of its divisors is an integer number (551565).

Almost surely, 2^21560448 is an apocalyptic number.

21560448 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21560448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35300160).

21560448 is an abundant number, since it is smaller than the sum of its proper divisors (49039872).

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

21560448 is a wasteful number, since it uses less digits than its factorization.

21560448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654 (or 642 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 21560448 is about 4643.3229480621. The cubic root of 21560448 is about 278.3252408594.

The spelling of 21560448 in words is "twenty-one million, five hundred sixty thousand, four hundred forty-eight".