21360896 has 36 divisors (see below), whose sum is σ = 42966924. Its totient is φ = 10598400.

The previous prime is 21360881. The next prime is 21360917. The reversal of 21360896 is 69806312.

It can be written as a sum of positive squares in 2 ways, for example, as 2560000 + 18800896 = 1600^2 + 4336^2 .

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, 46106 + ... + 46566.

Almost surely, 2^21360896 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 21360896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21483462).

21360896 is an abundant number, since it is smaller than the sum of its proper divisors (21606028).

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

21360896 is an equidigital number, since it uses as much as digits as its factorization.

21360896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658 (or 644 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 21360896 is about 4621.7849365802. The cubic root of 21360896 is about 277.4639013725.

The spelling of 21360896 in words is "twenty-one million, three hundred sixty thousand, eight hundred ninety-six".