6421143 has 8 divisors (see below), whose sum is σ = 8616688. Its totient is φ = 4253184.

The previous prime is 6421141. The next prime is 6421157. The reversal of 6421143 is 3411246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6421143 - 2¹ = 6421141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6346 + ... + 7287.

It is an arithmetic number, because the mean of its divisors is an integer number (1077086).

Almost surely, 2^6421143 is an apocalyptic number.

6421143 is a deficient number, since it is larger than the sum of its proper divisors (2195545).

6421143 is a wasteful number, since it uses less digits than its factorization.

6421143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13793.

The product of its digits is 576, while the sum is 21.

The square root of 6421143 is about 2533.9974348843. The cubic root of 6421143 is about 185.8677809325.

Adding to 6421143 its reverse (3411246), we get a palindrome (9832389).

The spelling of 6421143 in words is "six million, four hundred twenty-one thousand, one hundred forty-three".