129311120436 has 96 divisors (see below), whose sum is σ = 320066181120. Its totient is φ = 40519440000.

The previous prime is 129311120431. The next prime is 129311120453. The reversal of 129311120436 is 634021113921.

129311120436 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 129311120397 and 129311120406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129311120431) 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, 44789385 + ... + 44792271.

It is an arithmetic number, because the mean of its divisors is an integer number (3334022720).

Almost surely, 2^129311120436 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129311120436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160033090560).

129311120436 is an abundant number, since it is smaller than the sum of its proper divisors (190755060684).

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

129311120436 is a wasteful number, since it uses less digits than its factorization.

129311120436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4365 (or 4363 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The spelling of 129311120436 in words is "one hundred twenty-nine billion, three hundred eleven million, one hundred twenty thousand, four hundred thirty-six".