12129999634 has 4 divisors (see below), whose sum is σ = 18194999454. Its totient is φ = 6064999816.

The previous prime is 12129999631. The next prime is 12129999649. The reversal of 12129999634 is 43699992121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43699992121 = 2699 ⋅16191179.

It can be written as a sum of positive squares in only one way, i.e., 7031325609 + 5098674025 = 83853^2 + 71405^2 .

It is a super-2 number, since 2×12129999634² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12129999631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3032499907 + ... + 3032499910.

Almost surely, 2^12129999634 is an apocalyptic number.

12129999634 is a deficient number, since it is larger than the sum of its proper divisors (6064999820).

12129999634 is an equidigital number, since it uses as much as digits as its factorization.

12129999634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6064999819.

The product of its digits is 1889568, while the sum is 55.

The spelling of 12129999634 in words is "twelve billion, one hundred twenty-nine million, nine hundred ninety-nine thousand, six hundred thirty-four".