6421311 has 24 divisors (see below), whose sum is σ = 10142496. Its totient is φ = 3890880.

The previous prime is 6421279. The next prime is 6421339. The reversal of 6421311 is 1131246.

It is a happy number.

6421311 is a `hidden beast` number, since 642 + 13 + 11 = 666.

It is not a de Polignac number, because 6421311 - 2⁵ = 6421279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421351) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7921 + ... + 8693.

It is an arithmetic number, because the mean of its divisors is an integer number (422604).

Almost surely, 2^6421311 is an apocalyptic number.

6421311 is a deficient number, since it is larger than the sum of its proper divisors (3721185).

6421311 is a wasteful number, since it uses less digits than its factorization.

6421311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863 (or 860 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 6421311 is about 2534.0305838723. The cubic root of 6421311 is about 185.8694019064.

Adding to 6421311 its reverse (1131246), we get a palindrome (7552557).

It can be divided in two parts, 642 and 1311, that added together give a triangular number (1953 = T₆₂).

The spelling of 6421311 in words is "six million, four hundred twenty-one thousand, three hundred eleven".