21868615985 has 8 divisors (see below), whose sum is σ = 26302119360. Its totient is φ = 17455039344.

The previous prime is 21868615927. The next prime is 21868615997. The reversal of 21868615985 is 58951686812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21868615985 - 2¹² = 21868611889 is a prime.

It is an unprimeable number.

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, 4979267 + ... + 4983656.

It is an arithmetic number, because the mean of its divisors is an integer number (3287764920).

Almost surely, 2^21868615985 is an apocalyptic number.

It is an amenable number.

21868615985 is a deficient number, since it is larger than the sum of its proper divisors (4433503375).

21868615985 is an equidigital number, since it uses as much as digits as its factorization.

21868615985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9963367.

The product of its digits is 8294400, while the sum is 59.

The spelling of 21868615985 in words is "twenty-one billion, eight hundred sixty-eight million, six hundred fifteen thousand, nine hundred eighty-five".