129108129225 has 24 divisors (see below), whose sum is σ = 213804812640. Its totient is φ = 68746043520.

The previous prime is 129108129203. The next prime is 129108129239. The reversal of 129108129225 is 522921801921.

It is not a de Polignac number, because 129108129225 - 2⁷ = 129108129097 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1348735 + ... + 1441284.

It is an arithmetic number, because the mean of its divisors is an integer number (8908533860).

Almost surely, 2^129108129225 is an apocalyptic number.

129108129225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129108129225 is a deficient number, since it is larger than the sum of its proper divisors (84696683415).

129108129225 is a wasteful number, since it uses less digits than its factorization.

129108129225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2790649 (or 2790644 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 42.

The spelling of 129108129225 in words is "one hundred twenty-nine billion, one hundred eight million, one hundred twenty-nine thousand, two hundred twenty-five".