421957171 has 2 divisors, whose sum is σ = 421957172. Its totient is φ = 421957170.

The previous prime is 421957141. The next prime is 421957177. The reversal of 421957171 is 171759124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421957171 - 2⁹ = 421956659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 421957171.

It is not a weakly prime, because it can be changed into another prime (421957177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210978585 + 210978586.

It is an arithmetic number, because the mean of its divisors is an integer number (210978586).

Almost surely, 2^421957171 is an apocalyptic number.

421957171 is a deficient number, since it is larger than the sum of its proper divisors (1).

421957171 is an equidigital number, since it uses as much as digits as its factorization.

421957171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 37.

The square root of 421957171 is about 20541.5961161736. The cubic root of 421957171 is about 750.0486907648.

The spelling of 421957171 in words is "four hundred twenty-one million, nine hundred fifty-seven thousand, one hundred seventy-one".