6421210806 has 32 divisors (see below), whose sum is σ = 13228806240. Its totient is φ = 2076350976.

The previous prime is 6421210801. The next prime is 6421210867. The reversal of 6421210806 is 6080121246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421210801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31900 + ... + 117728.

It is an arithmetic number, because the mean of its divisors is an integer number (413400195).

Almost surely, 2^6421210806 is an apocalyptic number.

6421210806 is an abundant number, since it is smaller than the sum of its proper divisors (6807595434).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6421210806 is a wasteful number, since it uses less digits than its factorization.

6421210806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86208.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 6421210806 is about 80132.4578806865. The cubic root of 6421210806 is about 1858.6843517252.

The spelling of 6421210806 in words is "six billion, four hundred twenty-one million, two hundred ten thousand, eight hundred six".