21627875387 has 4 divisors (see below), whose sum is σ = 21641335536. Its totient is φ = 21614415240.

The previous prime is 21627875377. The next prime is 21627875429. The reversal of 21627875387 is 78357872612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21627875387 - 2¹⁶ = 21627809851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21627875317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6727664 + ... + 6730877.

It is an arithmetic number, because the mean of its divisors is an integer number (5410333884).

Almost surely, 2^21627875387 is an apocalyptic number.

21627875387 is a deficient number, since it is larger than the sum of its proper divisors (13460149).

21627875387 is a wasteful number, since it uses less digits than its factorization.

21627875387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13460148.

The product of its digits is 7902720, while the sum is 56.

The spelling of 21627875387 in words is "twenty-one billion, six hundred twenty-seven million, eight hundred seventy-five thousand, three hundred eighty-seven".