21826432 has 32 divisors (see below), whose sum is σ = 44553600. Its totient is φ = 10644480.

The previous prime is 21826417. The next prime is 21826439. The reversal of 21826432 is 23462812.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 21826432.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21826439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3169 + ... + 7327.

It is an arithmetic number, because the mean of its divisors is an integer number (1392300).

Almost surely, 2^21826432 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 21826432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22276800).

21826432 is an abundant number, since it is smaller than the sum of its proper divisors (22727168).

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

21826432 is an equidigital number, since it uses as much as digits as its factorization.

21826432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4214 (or 4202 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

The square root of 21826432 is about 4671.8767107020. The cubic root of 21826432 is about 279.4651012544.

The spelling of 21826432 in words is "twenty-one million, eight hundred twenty-six thousand, four hundred thirty-two".