21084096 has 112 divisors (see below), whose sum is σ = 62179200. Its totient is φ = 6251520.

The previous prime is 21084083. The next prime is 21084103. The reversal of 21084096 is 69048012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141430 + ... + 141578.

Almost surely, 2^21084096 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 21084096, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31089600).

21084096 is an abundant number, since it is smaller than the sum of its proper divisors (41095104).

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

21084096 is a wasteful number, since it uses less digits than its factorization.

21084096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 21084096 is about 4591.7421530395. The cubic root of 21084096 is about 276.2602040961.

It can be divided in two parts, 2108 and 4096, that multiplied together give a palindrome (8634368).

The spelling of 21084096 in words is "twenty-one million, eighty-four thousand, ninety-six".