21636096 has 44 divisors (see below), whose sum is σ = 57676272. Its totient is φ = 7211008.

The previous prime is 21636089. The next prime is 21636107. The reversal of 21636096 is 69063612.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 450 + ... + 6593.

Almost surely, 2^21636096 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 21636096, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28838136).

21636096 is an abundant number, since it is smaller than the sum of its proper divisors (36040176).

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

21636096 is an equidigital number, since it uses as much as digits as its factorization.

21636096 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7066 (or 7048 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 21636096 is about 4651.4617057437. The cubic root of 21636096 is about 278.6503758960.

The spelling of 21636096 in words is "twenty-one million, six hundred thirty-six thousand, ninety-six".