21267167171 has 4 divisors (see below), whose sum is σ = 21268093152. Its totient is φ = 21266241192.

The previous prime is 21267167101. The next prime is 21267167183. The reversal of 21267167171 is 17176176212.

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 21267167171 - 2²² = 21262972867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21267167101) 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, 427640 + ... + 474773.

It is an arithmetic number, because the mean of its divisors is an integer number (5317023288).

Almost surely, 2^21267167171 is an apocalyptic number.

21267167171 is a deficient number, since it is larger than the sum of its proper divisors (925981).

21267167171 is an equidigital number, since it uses as much as digits as its factorization.

21267167171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925980.

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

The spelling of 21267167171 in words is "twenty-one billion, two hundred sixty-seven million, one hundred sixty-seven thousand, one hundred seventy-one".