21675943696 has 40 divisors (see below), whose sum is σ = 46118530368. Its totient is φ = 9787440000.

The previous prime is 21675943669. The next prime is 21675943697. The reversal of 21675943696 is 69634957612.

It is a super-2 number, since 2×21675943696² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21675943696.

It is not an unprimeable number, because it can be changed into a prime (21675943697) 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 7 ways as a sum of consecutive naturals, for example, 381235 + ... + 434386.

Almost surely, 2^21675943696 is an apocalyptic number.

It is an amenable number.

21675943696 is an abundant number, since it is smaller than the sum of its proper divisors (24442586672).

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

21675943696 is a wasteful number, since it uses less digits than its factorization.

21675943696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815791 (or 815785 counting only the distinct ones).

The product of its digits is 14696640, while the sum is 58.

The spelling of 21675943696 in words is "twenty-one billion, six hundred seventy-five million, nine hundred forty-three thousand, six hundred ninety-six".