21596860881 has 12 divisors (see below), whose sum is σ = 31196926852. Its totient is φ = 14397232896.

The previous prime is 21596860871. The next prime is 21596860907. The reversal of 21596860881 is 18806869512.

It is a happy number.

21596860881 is a `hidden beast` number, since 21 + 5 + 9 + 6 + 8 + 608 + 8 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4897760256 + 16699100625 = 69984^2 + 129225^2 .

It is not a de Polignac number, because 21596860881 - 2⁵ = 21596860849 is a prime.

It is a super-2 number, since 2×21596860881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21596860801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 216045 + ... + 299781.

Almost surely, 2^21596860881 is an apocalyptic number.

It is an amenable number.

21596860881 is a deficient number, since it is larger than the sum of its proper divisors (9600065971).

21596860881 is a wasteful number, since it uses less digits than its factorization.

21596860881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112400 (or 112397 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 54.

The spelling of 21596860881 in words is "twenty-one billion, five hundred ninety-six million, eight hundred sixty thousand, eight hundred eighty-one".