21167105171 has 2 divisors, whose sum is σ = 21167105172. Its totient is φ = 21167105170.

The previous prime is 21167105159. The next prime is 21167105207. The reversal of 21167105171 is 17150176112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21167105171 is a prime.

It is not a weakly prime, because it can be changed into another prime (21167101171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10583552585 + 10583552586.

It is an arithmetic number, because the mean of its divisors is an integer number (10583552586).

Almost surely, 2^21167105171 is an apocalyptic number.

21167105171 is a deficient number, since it is larger than the sum of its proper divisors (1).

21167105171 is an equidigital number, since it uses as much as digits as its factorization.

21167105171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2940, while the sum is 32.

The spelling of 21167105171 in words is "twenty-one billion, one hundred sixty-seven million, one hundred five thousand, one hundred seventy-one".