6421199 has 4 divisors (see below), whose sum is σ = 6502560. Its totient is φ = 6339840.

The previous prime is 6421159. The next prime is 6421201. The reversal of 6421199 is 9911246.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6421199 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 (6421139) 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, 40562 + ... + 40719.

It is an arithmetic number, because the mean of its divisors is an integer number (1625640).

Almost surely, 2^6421199 is an apocalyptic number.

6421199 is a deficient number, since it is larger than the sum of its proper divisors (81361).

6421199 is an equidigital number, since it uses as much as digits as its factorization.

6421199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81360.

The product of its digits is 3888, while the sum is 32.

The square root of 6421199 is about 2534.0084845951. The cubic root of 6421199 is about 185.8683212603.

The spelling of 6421199 in words is "six million, four hundred twenty-one thousand, one hundred ninety-nine".