6421225213 has 16 divisors (see below), whose sum is σ = 6945847216. Its totient is φ = 5901050880.

The previous prime is 6421225141. The next prime is 6421225241. The reversal of 6421225213 is 3125221246.

It can be written as a sum of positive squares in 8 ways, for example, as 341436484 + 6079788729 = 18478^2 + 77973^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6421225213 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 (6421220213) 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, 4950181 + ... + 4951477.

It is an arithmetic number, because the mean of its divisors is an integer number (434115451).

Almost surely, 2^6421225213 is an apocalyptic number.

It is an amenable number.

6421225213 is a deficient number, since it is larger than the sum of its proper divisors (524622003).

6421225213 is a wasteful number, since it uses less digits than its factorization.

6421225213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2704.

The product of its digits is 5760, while the sum is 28.

The square root of 6421225213 is about 80132.5477755450. The cubic root of 6421225213 is about 1858.6857418081.

Adding to 6421225213 its reverse (3125221246), we get a palindrome (9546446459).

The spelling of 6421225213 in words is "six billion, four hundred twenty-one million, two hundred twenty-five thousand, two hundred thirteen".