129999999999972 has 48 divisors (see below), whose sum is σ = 308486399054400. Its totient is φ = 42597237386880.

The previous prime is 129999999999953. The next prime is 129999999999973. The reversal of 129999999999972 is 279999999999921.

129999999999972 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (129999999999973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15036222 + ... + 22047402.

It is an arithmetic number, because the mean of its divisors is an integer number (6426799980300).

Almost surely, 2^{129999999999972} is an apocalyptic number.

129999999999972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129999999999972 is an abundant number, since it is smaller than the sum of its proper divisors (178486399054428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129999999999972 is a wasteful number, since it uses less digits than its factorization.

129999999999972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7037436 (or 7037434 counting only the distinct ones).

The product of its digits is 878669669052, while the sum is 111.

The spelling of 129999999999972 in words is "one hundred twenty-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred seventy-two".