6717444221 has 4 divisors (see below), whose sum is σ = 6733868700. Its totient is φ = 6701019744.

The previous prime is 6717444191. The next prime is 6717444247. The reversal of 6717444221 is 1224447176.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5032341721 + 1685102500 = 70939^2 + 41050^2 .

It is a cyclic number.

It is not a de Polignac number, because 6717444221 - 2¹⁰ = 6717443197 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 (6717443221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8211626 + ... + 8212443.

It is an arithmetic number, because the mean of its divisors is an integer number (1683467175).

Almost surely, 2^6717444221 is an apocalyptic number.

It is an amenable number.

6717444221 is a deficient number, since it is larger than the sum of its proper divisors (16424479).

6717444221 is a wasteful number, since it uses less digits than its factorization.

6717444221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16424478.

The product of its digits is 75264, while the sum is 38.

The square root of 6717444221 is about 81960.0159895055. The cubic root of 6717444221 is about 1886.8383279977.

The spelling of 6717444221 in words is "six billion, seven hundred seventeen million, four hundred forty-four thousand, two hundred twenty-one".