84421891171 has 2 divisors, whose sum is σ = 84421891172. Its totient is φ = 84421891170.

The previous prime is 84421891157. The next prime is 84421891181. The reversal of 84421891171 is 17119812448.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84421891171 - 2⁵ = 84421891139 is a prime.

It is not a weakly prime, because it can be changed into another prime (84421891181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42210945585 + 42210945586.

It is an arithmetic number, because the mean of its divisors is an integer number (42210945586).

Almost surely, 2^84421891171 is an apocalyptic number.

84421891171 is a deficient number, since it is larger than the sum of its proper divisors (1).

84421891171 is an equidigital number, since it uses as much as digits as its factorization.

84421891171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 46.

The spelling of 84421891171 in words is "eighty-four billion, four hundred twenty-one million, eight hundred ninety-one thousand, one hundred seventy-one".