6421347899 has 4 divisors (see below), whose sum is σ = 6799074264. Its totient is φ = 6043621536.

The previous prime is 6421347883. The next prime is 6421347923. The reversal of 6421347899 is 9987431246.

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 6421347899 - 2⁴ = 6421347883 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6421347899.

It is not an unprimeable number, because it can be changed into a prime (6421343899) 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, 188863157 + ... + 188863190.

It is an arithmetic number, because the mean of its divisors is an integer number (1699768566).

Almost surely, 2^6421347899 is an apocalyptic number.

6421347899 is a deficient number, since it is larger than the sum of its proper divisors (377726365).

6421347899 is a wasteful number, since it uses less digits than its factorization.

6421347899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377726364.

The product of its digits is 2612736, while the sum is 53.

The square root of 6421347899 is about 80133.3132910402. The cubic root of 6421347899 is about 1858.6975792825.

It can be divided in two parts, 6421347 and 899, that added together give a palindrome (6422246).

The spelling of 6421347899 in words is "six billion, four hundred twenty-one million, three hundred forty-seven thousand, eight hundred ninety-nine".