21595606056 has 96 divisors (see below), whose sum is σ = 62019383400. Its totient is φ = 6765158400.

The previous prime is 21595606049. The next prime is 21595606063. The reversal of 21595606056 is 65060659512.

21595606056 is a `hidden beast` number, since 2 + 1 + 595 + 6 + 0 + 6 + 0 + 56 = 666.

It is an interprime number because it is at equal distance from previous prime (21595606049) and next prime (21595606063).

It can be written as a sum of positive squares in 4 ways, for example, as 20917836900 + 677769156 = 144630^2 + 26034^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 845440 + ... + 870608.

Almost surely, 2^21595606056 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 21595606056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31009691700).

21595606056 is an abundant number, since it is smaller than the sum of its proper divisors (40423777344).

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

21595606056 is a wasteful number, since it uses less digits than its factorization.

21595606056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25899 (or 25892 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 45.

The spelling of 21595606056 in words is "twenty-one billion, five hundred ninety-five million, six hundred six thousand, fifty-six".