21096656 has 60 divisors (see below), whose sum is σ = 48345120. Its totient is φ = 8890560.

The previous prime is 21096653. The next prime is 21096671. The reversal of 21096656 is 65669012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21096653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55475 + ... + 55853.

It is an arithmetic number, because the mean of its divisors is an integer number (805752).

Almost surely, 2^21096656 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 21096656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24172560).

21096656 is an abundant number, since it is smaller than the sum of its proper divisors (27248464).

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

21096656 is a wasteful number, since it uses less digits than its factorization.

21096656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472 (or 459 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 21096656 is about 4593.1096220317. The cubic root of 21096656 is about 276.3150501657.

The spelling of 21096656 in words is "twenty-one million, ninety-six thousand, six hundred fifty-six".