21288096 has 120 divisors (see below), whose sum is σ = 64399104. Its totient is φ = 6894720.

The previous prime is 21288083. The next prime is 21288119. The reversal of 21288096 is 69088212.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21288096.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 111361 + ... + 111551.

Almost surely, 2^21288096 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 21288096, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32199552).

21288096 is an abundant number, since it is smaller than the sum of its proper divisors (43111008).

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

21288096 is a wasteful number, since it uses less digits than its factorization.

21288096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 21288096 is about 4613.9024697104. The cubic root of 21288096 is about 277.1483346675.

The spelling of 21288096 in words is "twenty-one million, two hundred eighty-eight thousand, ninety-six".