12127999105 has 4 divisors (see below), whose sum is σ = 14553598932. Its totient is φ = 9702399280.

The previous prime is 12127999067. The next prime is 12127999109. The reversal of 12127999105 is 50199972121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1852527681 + 10275471424 = 43041^2 + 101368^2 .

It is not a de Polignac number, because 12127999105 - 2¹⁹ = 12127474817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12127999109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1212799906 + ... + 1212799915.

It is an arithmetic number, because the mean of its divisors is an integer number (3638399733).

Almost surely, 2^12127999105 is an apocalyptic number.

It is an amenable number.

12127999105 is a deficient number, since it is larger than the sum of its proper divisors (2425599827).

12127999105 is an equidigital number, since it uses as much as digits as its factorization.

12127999105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425599826.

The product of its (nonzero) digits is 102060, while the sum is 46.

The spelling of 12127999105 in words is "twelve billion, one hundred twenty-seven million, nine hundred ninety-nine thousand, one hundred five".