129860122920 has 256 divisors, whose sum is σ = 450375033600. Its totient is φ = 29604495360.

The previous prime is 129860122883. The next prime is 129860122927. The reversal of 129860122920 is 29221068921.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (129860122927) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 46426962 + ... + 46429758.

It is an arithmetic number, because the mean of its divisors is an integer number (1759277475).

Almost surely, 2^129860122920 is an apocalyptic number.

129860122920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129860122920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (225187516800).

129860122920 is an abundant number, since it is smaller than the sum of its proper divisors (320514910680).

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

129860122920 is a wasteful number, since it uses less digits than its factorization.

129860122920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4908 (or 4904 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The spelling of 129860122920 in words is "one hundred twenty-nine billion, eight hundred sixty million, one hundred twenty-two thousand, nine hundred twenty".