21852544 has 64 divisors (see below), whose sum is σ = 51530400. Its totient is φ = 9042432.

The previous prime is 21852539. The next prime is 21852547. The reversal of 21852544 is 44525812.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21852547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 753522 + ... + 753550.

Almost surely, 2^21852544 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 21852544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25765200).

21852544 is an abundant number, since it is smaller than the sum of its proper divisors (29677856).

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

21852544 is an frugal number, since it uses more digits than its factorization.

21852544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 38 counting only the distinct ones).

The product of its digits is 12800, while the sum is 31.

The square root of 21852544 is about 4674.6704696695. The cubic root of 21852544 is about 279.5765026443.

The spelling of 21852544 in words is "twenty-one million, eight hundred fifty-two thousand, five hundred forty-four".