6923312721 has 12 divisors (see below), whose sum is σ = 10769597748. Its totient is φ = 4260500064.

The previous prime is 6923312707. The next prime is 6923312723. The reversal of 6923312721 is 1272133296.

It can be written as a sum of positive squares in 2 ways, for example, as 1565072721 + 5358240000 = 39561^2 + 73200^2 .

It is not a de Polignac number, because 6923312721 - 2⁵ = 6923312689 is a prime.

It is a super-3 number, since 3×6923312721³ (a number of 30 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (6923312723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29586690 + ... + 29586923.

It is an arithmetic number, because the mean of its divisors is an integer number (897466479).

Almost surely, 2^6923312721 is an apocalyptic number.

It is an amenable number.

6923312721 is a deficient number, since it is larger than the sum of its proper divisors (3846285027).

6923312721 is a wasteful number, since it uses less digits than its factorization.

6923312721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59173632 (or 59173629 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 6923312721 is about 83206.4463908897. The cubic root of 6923312721 is about 1905.9199219135.

The spelling of 6923312721 in words is "six billion, nine hundred twenty-three million, three hundred twelve thousand, seven hundred twenty-one".