21544032 has 96 divisors (see below), whose sum is σ = 61471872. Its totient is φ = 6580224.

The previous prime is 21544021. The next prime is 21544037. The reversal of 21544032 is 23044512.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21544037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70023 + ... + 70329.

It is an arithmetic number, because the mean of its divisors is an integer number (640332).

Almost surely, 2^21544032 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 21544032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30735936).

21544032 is an abundant number, since it is smaller than the sum of its proper divisors (39927840).

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

21544032 is a wasteful number, since it uses less digits than its factorization.

21544032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380 (or 372 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 21544032 is about 4641.5549118803. The cubic root of 21544032 is about 278.2545845161.

Adding to 21544032 its reverse (23044512), we get a palindrome (44588544).

The spelling of 21544032 in words is "twenty-one million, five hundred forty-four thousand, thirty-two".