21382448 has 40 divisors (see below), whose sum is σ = 44811120. Its totient is φ = 9849600.

The previous prime is 21382441. The next prime is 21382453. The reversal of 21382448 is 84428312.

It is not an unprimeable number, because it can be changed into a prime (21382441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10298 + ... + 12198.

It is an arithmetic number, because the mean of its divisors is an integer number (1120278).

Almost surely, 2^21382448 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 21382448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22405560).

21382448 is an abundant number, since it is smaller than the sum of its proper divisors (23428672).

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

21382448 is a wasteful number, since it uses less digits than its factorization.

21382448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1965 (or 1959 counting only the distinct ones).

The product of its digits is 12288, while the sum is 32.

The square root of 21382448 is about 4624.1159155021. The cubic root of 21382448 is about 277.5571854120.

The spelling of 21382448 in words is "twenty-one million, three hundred eighty-two thousand, four hundred forty-eight".