12126131305 has 4 divisors (see below), whose sum is σ = 14551357572. Its totient is φ = 9700905040.

The previous prime is 12126131243. The next prime is 12126131377. The reversal of 12126131305 is 50313162121.

It is a happy number.

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 5611058649 + 6515072656 = 74907^2 + 80716^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12126131305 is a prime.

It is a super-2 number, since 2×12126131305² (a number of 21 digits) contains 22 as substring.

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 12126131305.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1212613126 + ... + 1212613135.

It is an arithmetic number, because the mean of its divisors is an integer number (3637839393).

Almost surely, 2^12126131305 is an apocalyptic number.

It is an amenable number.

12126131305 is a deficient number, since it is larger than the sum of its proper divisors (2425226267).

12126131305 is an equidigital number, since it uses as much as digits as its factorization.

12126131305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2425226266.

The product of its (nonzero) digits is 1080, while the sum is 25.

Adding to 12126131305 its reverse (50313162121), we get a palindrome (62439293426).

The spelling of 12126131305 in words is "twelve billion, one hundred twenty-six million, one hundred thirty-one thousand, three hundred five".