421391171 has 4 divisors (see below), whose sum is σ = 421438344. Its totient is φ = 421344000.

The previous prime is 421391147. The next prime is 421391197. The reversal of 421391171 is 171193124.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 421391171 - 2⁶ = 421391107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421390171) 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, 5630 + ... + 29571.

It is an arithmetic number, because the mean of its divisors is an integer number (105359586).

Almost surely, 2^421391171 is an apocalyptic number.

421391171 is a deficient number, since it is larger than the sum of its proper divisors (47173).

421391171 is a wasteful number, since it uses less digits than its factorization.

421391171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47172.

The product of its digits is 1512, while the sum is 29.

The square root of 421391171 is about 20527.8145695054. The cubic root of 421391171 is about 749.7131768425.

The spelling of 421391171 in words is "four hundred twenty-one million, three hundred ninety-one thousand, one hundred seventy-one".