21167716127 has 4 divisors (see below), whose sum is σ = 21255549216. Its totient is φ = 21079883040.

The previous prime is 21167716103. The next prime is 21167716159. The reversal of 21167716127 is 72161776112.

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 21167716127 - 2²² = 21163521823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21167716187) 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, 43916183 + ... + 43916664.

It is an arithmetic number, because the mean of its divisors is an integer number (5313887304).

Almost surely, 2^21167716127 is an apocalyptic number.

21167716127 is a deficient number, since it is larger than the sum of its proper divisors (87833089).

21167716127 is an equidigital number, since it uses as much as digits as its factorization.

21167716127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87833088.

The product of its digits is 49392, while the sum is 41.

The spelling of 21167716127 in words is "twenty-one billion, one hundred sixty-seven million, seven hundred sixteen thousand, one hundred twenty-seven".