21711516171 has 8 divisors (see below), whose sum is σ = 28950836880. Its totient is φ = 14473269792.

The previous prime is 21711516161. The next prime is 21711516173. The reversal of 21711516171 is 17161511712.

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

It is not a de Polignac number, because 21711516171 - 2²⁶ = 21644407307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21711516173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220180 + ... + 303153.

It is an arithmetic number, because the mean of its divisors is an integer number (3618854610).

Almost surely, 2^21711516171 is an apocalyptic number.

21711516171 is a deficient number, since it is larger than the sum of its proper divisors (7239320709).

21711516171 is a wasteful number, since it uses less digits than its factorization.

21711516171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537165.

The product of its digits is 2940, while the sum is 33.

The spelling of 21711516171 in words is "twenty-one billion, seven hundred eleven million, five hundred sixteen thousand, one hundred seventy-one".