21627875385 has 12 divisors (see below), whose sum is σ = 37488317412. Its totient is φ = 11534866848.

The previous prime is 21627875377. The next prime is 21627875429. The reversal of 21627875385 is 58357872612.

21627875385 is a `hidden beast` number, since 2 + 1 + 6 + 27 + 87 + 538 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17132977449 + 4494897936 = 130893^2 + 67044^2 .

It is not a de Polignac number, because 21627875385 - 2³ = 21627875377 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 240309682 + ... + 240309771.

It is an arithmetic number, because the mean of its divisors is an integer number (3124026451).

Almost surely, 2^21627875385 is an apocalyptic number.

It is an amenable number.

21627875385 is a deficient number, since it is larger than the sum of its proper divisors (15860442027).

21627875385 is a wasteful number, since it uses less digits than its factorization.

21627875385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480619464 (or 480619461 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 54.

The spelling of 21627875385 in words is "twenty-one billion, six hundred twenty-seven million, eight hundred seventy-five thousand, three hundred eighty-five".