21886208 has 72 divisors (see below), whose sum is σ = 47682432. Its totient is φ = 9986048.

The previous prime is 21886199. The next prime is 21886223. The reversal of 21886208 is 80268812.

It is a super-2 number, since 2×21886208² = 958012201238528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 204491 + ... + 204597.

It is an arithmetic number, because the mean of its divisors is an integer number (662256).

Almost surely, 2^21886208 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 21886208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23841216).

21886208 is an abundant number, since it is smaller than the sum of its proper divisors (25796224).

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

21886208 is a wasteful number, since it uses less digits than its factorization.

21886208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 21886208 is about 4678.2697656292. The cubic root of 21886208 is about 279.7199921866.

The spelling of 21886208 in words is "twenty-one million, eight hundred eighty-six thousand, two hundred eight".