21852128 has 48 divisors (see below), whose sum is σ = 45803520. Its totient is φ = 10233216.

The previous prime is 21852121. The next prime is 21852137. The reversal of 21852128 is 82125812.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21852128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21852121) 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, 77075 + ... + 77357.

It is an arithmetic number, because the mean of its divisors is an integer number (954240).

Almost surely, 2^21852128 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 21852128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22901760).

21852128 is an abundant number, since it is smaller than the sum of its proper divisors (23951392).

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

21852128 is a wasteful number, since it uses less digits than its factorization.

21852128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439 (or 431 counting only the distinct ones).

The product of its digits is 2560, while the sum is 29.

The square root of 21852128 is about 4674.6259743428. The cubic root of 21852128 is about 279.5747285631.

The spelling of 21852128 in words is "twenty-one million, eight hundred fifty-two thousand, one hundred twenty-eight".