21804096 has 112 divisors (see below), whose sum is σ = 62585600. Its totient is φ = 6676992.

The previous prime is 21804091. The next prime is 21804109. The reversal of 21804096 is 69040812.

It is not an unprimeable number, because it can be changed into a prime (21804091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156795 + ... + 156933.

It is an arithmetic number, because the mean of its divisors is an integer number (558800).

Almost surely, 2^21804096 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 21804096, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31292800).

21804096 is an abundant number, since it is smaller than the sum of its proper divisors (40781504).

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

21804096 is a wasteful number, since it uses less digits than its factorization.

21804096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216 (or 206 counting only the distinct ones).

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

The square root of 21804096 is about 4669.4856247771. The cubic root of 21804096 is about 279.3697388516.

The spelling of 21804096 in words is "twenty-one million, eight hundred four thousand, ninety-six".