21080448 has 96 divisors (see below), whose sum is σ = 62852400. Its totient is φ = 6773760.

The previous prime is 21080447. The next prime is 21080467. The reversal of 21080448 is 84408012.

21080448 is a `hidden beast` number, since 210 + 8 + 0 + 448 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21080447) 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, 33093 + ... + 33723.

Almost surely, 2^21080448 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 21080448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31426200).

21080448 is an abundant number, since it is smaller than the sum of its proper divisors (41771952).

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

21080448 is a wasteful number, since it uses less digits than its factorization.

21080448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680 (or 665 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 21080448 is about 4591.3449010067. The cubic root of 21080448 is about 276.2442702005.

It can be divided in two parts, 21080 and 448, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 21080448 in words is "twenty-one million, eighty thousand, four hundred forty-eight".