421693271 has 2 divisors, whose sum is σ = 421693272. Its totient is φ = 421693270.

The previous prime is 421693253. The next prime is 421693291. The reversal of 421693271 is 172396124.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421693271 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is equal to p_22429808 and since 421693271 and 22429808 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421693291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210846635 + 210846636.

It is an arithmetic number, because the mean of its divisors is an integer number (210846636).

Almost surely, 2^421693271 is an apocalyptic number.

421693271 is a deficient number, since it is larger than the sum of its proper divisors (1).

421693271 is an equidigital number, since it uses as much as digits as its factorization.

421693271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 421693271 is about 20535.1715600333. The cubic root of 421693271 is about 749.8922932738.

The spelling of 421693271 in words is "four hundred twenty-one million, six hundred ninety-three thousand, two hundred seventy-one".