21896208 has 120 divisors (see below), whose sum is σ = 66156480. Its totient is φ = 6739200.

The previous prime is 21896201. The next prime is 21896209. The reversal of 21896208 is 80269812.

21896208 is a `hidden beast` number, since 21 + 8 + 9 + 620 + 8 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (21896201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 144933 + ... + 145083.

It is an arithmetic number, because the mean of its divisors is an integer number (551304).

Almost surely, 2^21896208 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 21896208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33078240).

21896208 is an abundant number, since it is smaller than the sum of its proper divisors (44260272).

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

21896208 is a wasteful number, since it uses less digits than its factorization.

21896208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237 (or 228 counting only the distinct ones).

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

The square root of 21896208 is about 4679.3384147762. The cubic root of 21896208 is about 279.7625878707.

The spelling of 21896208 in words is "twenty-one million, eight hundred ninety-six thousand, two hundred eight".