12129999999999 has 32 divisors (see below), whose sum is σ = 18496196050944. Its totient is φ = 6926784789600.

The previous prime is 12129999999961. The next prime is 12130000000081. The reversal of 12129999999999 is 99999999992121.

It is a happy number.

It is not a de Polignac number, because 12129999999999 - 2¹³ = 12129999991807 is a prime.

It is a super-9 number, since 9×12129999999999⁹ (a number of 119 digits) contains 999999999 as substring.

12129999999999 is a modest number, since divided by 9999999 gives 1212999 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12129999999919) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 310663572 + ... + 310702614.

It is an arithmetic number, because the mean of its divisors is an integer number (578006126592).

Almost surely, 2^{12129999999999} is an apocalyptic number.

12129999999999 is a deficient number, since it is larger than the sum of its proper divisors (6366196050945).

12129999999999 is a wasteful number, since it uses less digits than its factorization.

12129999999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48587.

The product of its digits is 13947137604, while the sum is 96.

The spelling of 12129999999999 in words is "twelve trillion, one hundred twenty-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".