12697721271 has 56 divisors (see below), whose sum is σ = 19486178880. Its totient is φ = 8268189696.

The previous prime is 12697721269. The next prime is 12697721287. The reversal of 12697721271 is 17212779621.

It is not a de Polignac number, because 12697721271 - 2¹ = 12697721269 is a prime.

It is a super-2 number, since 2×12697721271² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12697721171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 5585191 + ... + 5587463.

It is an arithmetic number, because the mean of its divisors is an integer number (347967480).

Almost surely, 2^12697721271 is an apocalyptic number.

12697721271 is a deficient number, since it is larger than the sum of its proper divisors (6788457609).

12697721271 is an frugal number, since it uses more digits than its factorization.

12697721271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2467 (or 2452 counting only the distinct ones).

The product of its digits is 148176, while the sum is 45.

The spelling of 12697721271 in words is "twelve billion, six hundred ninety-seven million, seven hundred twenty-one thousand, two hundred seventy-one".