21326448 has 120 divisors (see below), whose sum is σ = 65352960. Its totient is φ = 5940480.

The previous prime is 21326441. The next prime is 21326477. The reversal of 21326448 is 84462312.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21326441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89113 + ... + 89351.

It is an arithmetic number, because the mean of its divisors is an integer number (544608).

Almost surely, 2^21326448 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 21326448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32676480).

21326448 is an abundant number, since it is smaller than the sum of its proper divisors (44026512).

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

21326448 is a wasteful number, since it uses less digits than its factorization.

21326448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287 (or 268 counting only the distinct ones).

The product of its digits is 9216, while the sum is 30.

The square root of 21326448 is about 4618.0567341686. The cubic root of 21326448 is about 277.3146688828.

It can be divided in two parts, 213264 and 48, that added together give a palindrome (213312).

The spelling of 21326448 in words is "twenty-one million, three hundred twenty-six thousand, four hundred forty-eight".