6421331 has 4 divisors (see below), whose sum is σ = 7338672. Its totient is φ = 5503992.

The previous prime is 6421279. The next prime is 6421339. The reversal of 6421331 is 1331246.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6421331 - 2¹⁰ = 6420307 is a prime.

It is a super-2 number, since 2×6421331² = 82466983623122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6421339) 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, 458660 + ... + 458673.

It is an arithmetic number, because the mean of its divisors is an integer number (1834668).

Almost surely, 2^6421331 is an apocalyptic number.

6421331 is a deficient number, since it is larger than the sum of its proper divisors (917341).

6421331 is an equidigital number, since it uses as much as digits as its factorization.

6421331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917340.

The product of its digits is 432, while the sum is 20.

The square root of 6421331 is about 2534.0345301515. The cubic root of 6421331 is about 185.8695948775.

Adding to 6421331 its reverse (1331246), we get a palindrome (7752577).

The spelling of 6421331 in words is "six million, four hundred twenty-one thousand, three hundred thirty-one".