12129678999 has 6 divisors (see below), whose sum is σ = 17520647456. Its totient is φ = 8086452660.

The previous prime is 12129678937. The next prime is 12129679007. The reversal of 12129678999 is 99987692121.

It is not a de Polignac number, because 12129678999 - 2¹³ = 12129670807 is a prime.

It is a super-2 number, since 2×12129678999² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12129678499) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 673871047 + ... + 673871064.

Almost surely, 2^12129678999 is an apocalyptic number.

12129678999 is a deficient number, since it is larger than the sum of its proper divisors (5390968457).

12129678999 is a wasteful number, since it uses less digits than its factorization.

12129678999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347742117 (or 1347742114 counting only the distinct ones).

The product of its digits is 8817984, while the sum is 63.

The spelling of 12129678999 in words is "twelve billion, one hundred twenty-nine million, six hundred seventy-eight thousand, nine hundred ninety-nine".