21444352 has 36 divisors (see below), whose sum is σ = 43116136. Its totient is φ = 10644480.

The previous prime is 21444347. The next prime is 21444373. The reversal of 21444352 is 25344412.

It is a happy number.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53818 + ... + 54214.

Almost surely, 2^21444352 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 21444352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21558068).

21444352 is an abundant number, since it is smaller than the sum of its proper divisors (21671784).

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

21444352 is an equidigital number, since it uses as much as digits as its factorization.

21444352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624 (or 610 counting only the distinct ones).

The product of its digits is 3840, while the sum is 25.

The square root of 21444352 is about 4630.8046816941. The cubic root of 21444352 is about 277.8247778723.

Adding to 21444352 its reverse (25344412), we get a palindrome (46788764).

The spelling of 21444352 in words is "twenty-one million, four hundred forty-four thousand, three hundred fifty-two".