6811687221 has 8 divisors (see below), whose sum is σ = 9093235104. Its totient is φ = 4535632080.

The previous prime is 6811687219. The next prime is 6811687297. The reversal of 6811687221 is 1227861186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6811687221 - 2¹ = 6811687219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6811607221) 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 7 ways as a sum of consecutive naturals, for example, 1370290 + ... + 1375251.

It is an arithmetic number, because the mean of its divisors is an integer number (1136654388).

Almost surely, 2^6811687221 is an apocalyptic number.

It is an amenable number.

6811687221 is a deficient number, since it is larger than the sum of its proper divisors (2281547883).

6811687221 is a wasteful number, since it uses less digits than its factorization.

6811687221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2746371.

The product of its digits is 64512, while the sum is 42.

The square root of 6811687221 is about 82532.9462760176. The cubic root of 6811687221 is about 1895.6212387554.

The spelling of 6811687221 in words is "six billion, eight hundred eleven million, six hundred eighty-seven thousand, two hundred twenty-one".