12721431117 has 16 divisors (see below), whose sum is σ = 17012695040. Its totient is φ = 8455590000.

The previous prime is 12721431113. The next prime is 12721431119. The reversal of 12721431117 is 71113412721.

It is not a de Polignac number, because 12721431117 - 2² = 12721431113 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12721431113) 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, 2566992 + ... + 2571942.

It is an arithmetic number, because the mean of its divisors is an integer number (1063293440).

Almost surely, 2^12721431117 is an apocalyptic number.

It is an amenable number.

12721431117 is a deficient number, since it is larger than the sum of its proper divisors (4291263923).

12721431117 is a wasteful number, since it uses less digits than its factorization.

12721431117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7344.

The product of its digits is 2352, while the sum is 30.

Adding to 12721431117 its reverse (71113412721), we get a palindrome (83834843838).

The spelling of 12721431117 in words is "twelve billion, seven hundred twenty-one million, four hundred thirty-one thousand, one hundred seventeen".