21852288 has 64 divisors (see below), whose sum is σ = 64504800. Its totient is φ = 7282944.

The previous prime is 21852287. The next prime is 21852307. The reversal of 21852288 is 88225812.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21852287) 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, 295 + ... + 6617.

Almost surely, 2^21852288 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 21852288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32252400).

21852288 is an abundant number, since it is smaller than the sum of its proper divisors (42652512).

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

21852288 is an equidigital number, since it uses as much as digits as its factorization.

21852288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6346 (or 6328 counting only the distinct ones).

The product of its digits is 20480, while the sum is 36.

The square root of 21852288 is about 4674.6430879801. The cubic root of 21852288 is about 279.5754109047.

The spelling of 21852288 in words is "twenty-one million, eight hundred fifty-two thousand, two hundred eighty-eight".