84421171 has 2 divisors, whose sum is σ = 84421172. Its totient is φ = 84421170.

The previous prime is 84421157. The next prime is 84421177. The reversal of 84421171 is 17112448.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84421171 is a prime.

It is a super-2 number, since 2×84421171² = 14253868226022482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (84421177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42210585 + 42210586.

It is an arithmetic number, because the mean of its divisors is an integer number (42210586).

Almost surely, 2^84421171 is an apocalyptic number.

84421171 is a deficient number, since it is larger than the sum of its proper divisors (1).

84421171 is an equidigital number, since it uses as much as digits as its factorization.

84421171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1792, while the sum is 28.

The square root of 84421171 is about 9188.0994226227. The cubic root of 84421171 is about 438.6826490016.

The spelling of 84421171 in words is "eighty-four million, four hundred twenty-one thousand, one hundred seventy-one".