12721431107 has 24 divisors (see below), whose sum is σ = 16169103360. Its totient is φ = 9897210960.

The previous prime is 12721431103. The next prime is 12721431113. The reversal of 12721431107 is 70113412721.

It is not a de Polignac number, because 12721431107 - 2² = 12721431103 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12721431107.

It is not an unprimeable number, because it can be changed into a prime (12721431101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 330494 + ... + 366972.

It is an arithmetic number, because the mean of its divisors is an integer number (673712640).

Almost surely, 2^12721431107 is an apocalyptic number.

12721431107 is a deficient number, since it is larger than the sum of its proper divisors (3447672253).

12721431107 is a wasteful number, since it uses less digits than its factorization.

12721431107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37151 (or 37144 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 29.

Adding to 12721431107 its reverse (70113412721), we get a palindrome (82834843828).

The spelling of 12721431107 in words is "twelve billion, seven hundred twenty-one million, four hundred thirty-one thousand, one hundred seven".