6421271 has 2 divisors, whose sum is σ = 6421272. Its totient is φ = 6421270.

The previous prime is 6421249. The next prime is 6421279. The reversal of 6421271 is 1721246.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6421271 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6421279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3210635 + 3210636.

It is an arithmetic number, because the mean of its divisors is an integer number (3210636).

Almost surely, 2^6421271 is an apocalyptic number.

6421271 is a deficient number, since it is larger than the sum of its proper divisors (1).

6421271 is an equidigital number, since it uses as much as digits as its factorization.

6421271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 23.

The square root of 6421271 is about 2534.0226912954. The cubic root of 6421271 is about 185.8690159628.

The spelling of 6421271 in words is "six million, four hundred twenty-one thousand, two hundred seventy-one".