21896128 has 28 divisors (see below), whose sum is σ = 43616880. Its totient is φ = 10906112.

The previous prime is 21896099. The next prime is 21896167. The reversal of 21896128 is 82169812.

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 3 ways as a sum of consecutive naturals, for example, 22500 + ... + 23452.

Almost surely, 2^21896128 is an apocalyptic number.

It is an amenable number.

21896128 is a deficient number, since it is larger than the sum of its proper divisors (21720752).

21896128 is an equidigital number, since it uses as much as digits as its factorization.

21896128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324 (or 1314 counting only the distinct ones).

The product of its digits is 13824, while the sum is 37.

The square root of 21896128 is about 4679.3298665514. The cubic root of 21896128 is about 279.7622471567.

The spelling of 21896128 in words is "twenty-one million, eight hundred ninety-six thousand, one hundred twenty-eight".