21885696 has 216 divisors, whose sum is σ = 76527360. Its totient is φ = 5879808.

The previous prime is 21885671. The next prime is 21885697. The reversal of 21885696 is 69658812.

21885696 is a `hidden beast` number, since 2 + 1 + 88 + 569 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (21885697) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 370915 + ... + 370973.

Almost surely, 2^21885696 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 21885696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38263680).

21885696 is an abundant number, since it is smaller than the sum of its proper divisors (54641664).

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

21885696 is a wasteful number, since it uses less digits than its factorization.

21885696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111 (or 94 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 21885696 is about 4678.2150442236. The cubic root of 21885696 is about 279.7178109384.

Subtracting from 21885696 its product of digits (207360), we obtain a square (21678336 = 4656²).

The spelling of 21885696 in words is "twenty-one million, eight hundred eighty-five thousand, six hundred ninety-six".