6817189221 has 6 divisors (see below), whose sum is σ = 9847051110. Its totient is φ = 4544792808.

The previous prime is 6817189219. The next prime is 6817189229. The reversal of 6817189221 is 1229817186.

It can be written as a sum of positive squares in only one way, i.e., 5186160225 + 1631028996 = 72015^2 + 40386^2 .

It is not a de Polignac number, because 6817189221 - 2¹ = 6817189219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6817189229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 378732726 + ... + 378732743.

It is an arithmetic number, because the mean of its divisors is an integer number (1641175185).

Almost surely, 2^6817189221 is an apocalyptic number.

It is an amenable number.

6817189221 is a deficient number, since it is larger than the sum of its proper divisors (3029861889).

6817189221 is a wasteful number, since it uses less digits than its factorization.

6817189221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757465475 (or 757465472 counting only the distinct ones).

The product of its digits is 96768, while the sum is 45.

The square root of 6817189221 is about 82566.2716912905. The cubic root of 6817189221 is about 1896.1314843989.

The spelling of 6817189221 in words is "six billion, eight hundred seventeen million, one hundred eighty-nine thousand, two hundred twenty-one".