21825960687 has 96 divisors (see below), whose sum is σ = 34717662720. Its totient is φ = 13167947520.

The previous prime is 21825960679. The next prime is 21825960691. The reversal of 21825960687 is 78606952812.

21825960687 is a `hidden beast` number, since 2 + 1 + 8 + 25 + 9 + 606 + 8 + 7 = 666.

It is not a de Polignac number, because 21825960687 - 2³ = 21825960679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21825960887) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 68851453 + ... + 68851769.

It is an arithmetic number, because the mean of its divisors is an integer number (361642320).

Almost surely, 2^21825960687 is an apocalyptic number.

21825960687 is a deficient number, since it is larger than the sum of its proper divisors (12891702033).

21825960687 is a wasteful number, since it uses less digits than its factorization.

21825960687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573 (or 570 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 21825960687 in words is "twenty-one billion, eight hundred twenty-five million, nine hundred sixty thousand, six hundred eighty-seven".