2686836721 has 12 divisors (see below), whose sum is σ = 2840059344. Its totient is φ = 2541504600.

The previous prime is 2686836709. The next prime is 2686836751. The reversal of 2686836721 is 1276386862.

It is a de Polignac number, because none of the positive numbers 2^k-2686836721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2686836751) 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, 244066 + ... + 254836.

It is an arithmetic number, because the mean of its divisors is an integer number (236671612).

Almost surely, 2^2686836721 is an apocalyptic number.

It is an amenable number.

2686836721 is a deficient number, since it is larger than the sum of its proper divisors (153222623).

2686836721 is a wasteful number, since it uses less digits than its factorization.

2686836721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11500 (or 11481 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 49.

The square root of 2686836721 is about 51834.7057578221. The cubic root of 2686836721 is about 1390.2100541723.

The spelling of 2686836721 in words is "two billion, six hundred eighty-six million, eight hundred thirty-six thousand, seven hundred twenty-one".