21326432 has 48 divisors (see below), whose sum is σ = 44906400. Its totient is φ = 9934848.

The previous prime is 21326429. The next prime is 21326441. The reversal of 21326432 is 23462312.

It is a junction number, because it is equal to n+sod(n) for n = 21326398 and 21326407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107069 + ... + 107267.

It is an arithmetic number, because the mean of its divisors is an integer number (935550).

Almost surely, 2^21326432 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 21326432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22453200).

21326432 is an abundant number, since it is smaller than the sum of its proper divisors (23579968).

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

21326432 is a wasteful number, since it uses less digits than its factorization.

21326432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423 (or 415 counting only the distinct ones).

The product of its digits is 1728, while the sum is 23.

The square root of 21326432 is about 4618.0550018379. The cubic root of 21326432 is about 277.3145995317.

Adding to 21326432 its reverse (23462312), we get a palindrome (44788744).

The spelling of 21326432 in words is "twenty-one million, three hundred twenty-six thousand, four hundred thirty-two".