21134018171 has 4 divisors (see below), whose sum is σ = 24153163632. Its totient is φ = 18114872712.

The previous prime is 21134018083. The next prime is 21134018189. The reversal of 21134018171 is 17181043112.

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 21134018171 - 2¹⁰ = 21134017147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21134018371) 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, 1509572720 + ... + 1509572733.

It is an arithmetic number, because the mean of its divisors is an integer number (6038290908).

Almost surely, 2^21134018171 is an apocalyptic number.

21134018171 is a deficient number, since it is larger than the sum of its proper divisors (3019145461).

21134018171 is an equidigital number, since it uses as much as digits as its factorization.

21134018171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3019145460.

The product of its (nonzero) digits is 1344, while the sum is 29.

The spelling of 21134018171 in words is "twenty-one billion, one hundred thirty-four million, eighteen thousand, one hundred seventy-one".