12871397121 has 16 divisors (see below), whose sum is σ = 18733617408. Its totient is φ = 7796019600.

The previous prime is 12871397113. The next prime is 12871397137. The reversal of 12871397121 is 12179317821.

It is not a de Polignac number, because 12871397121 - 2³ = 12871397113 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12871397101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66175 + ... + 173556.

It is an arithmetic number, because the mean of its divisors is an integer number (1170851088).

Almost surely, 2^12871397121 is an apocalyptic number.

12871397121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12871397121 is a deficient number, since it is larger than the sum of its proper divisors (5862220287).

12871397121 is a wasteful number, since it uses less digits than its factorization.

12871397121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241372.

The product of its digits is 42336, while the sum is 42.

The spelling of 12871397121 in words is "twelve billion, eight hundred seventy-one million, three hundred ninety-seven thousand, one hundred twenty-one".