21084882 has 96 divisors (see below), whose sum is σ = 54999168. Its totient is φ = 5246208.

The previous prime is 21084881. The next prime is 21084887. The reversal of 21084882 is 28848012.

It is not an unprimeable number, because it can be changed into a prime (21084881) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 288798 + ... + 288870.

It is an arithmetic number, because the mean of its divisors is an integer number (572908).

Almost surely, 2^21084882 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21084882, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27499584).

21084882 is an abundant number, since it is smaller than the sum of its proper divisors (33914286).

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

21084882 is a wasteful number, since it uses less digits than its factorization.

21084882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 33.

The square root of 21084882 is about 4591.8277406715. The cubic root of 21084882 is about 276.2636369810.

The spelling of 21084882 in words is "twenty-one million, eighty-four thousand, eight hundred eighty-two".