21137479175 has 12 divisors (see below), whose sum is σ = 26217904536. Its totient is φ = 16905189600.

The previous prime is 21137479163. The next prime is 21137479189. The reversal of 21137479175 is 57197473112.

It is not a de Polignac number, because 21137479175 - 2⁸ = 21137478919 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 28529 + ... + 207578.

It is an arithmetic number, because the mean of its divisors is an integer number (2184825378).

Almost surely, 2^21137479175 is an apocalyptic number.

21137479175 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21137479175 is a deficient number, since it is larger than the sum of its proper divisors (5080425361).

21137479175 is a wasteful number, since it uses less digits than its factorization.

21137479175 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239698 (or 239693 counting only the distinct ones).

The product of its digits is 370440, while the sum is 47.

The spelling of 21137479175 in words is "twenty-one billion, one hundred thirty-seven million, four hundred seventy-nine thousand, one hundred seventy-five".