129215311020 has 192 divisors, whose sum is σ = 419046566400. Its totient is φ = 33014741760.

The previous prime is 129215311013. The next prime is 129215311051. The reversal of 129215311020 is 20113512921.

129215311020 is a `hidden beast` number, since 1 + 2 + 9 + 21 + 531 + 102 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2019967 + ... + 2082953.

It is an arithmetic number, because the mean of its divisors is an integer number (2182534200).

Almost surely, 2^129215311020 is an apocalyptic number.

129215311020 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 129215311020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209523283200).

129215311020 is an abundant number, since it is smaller than the sum of its proper divisors (289831255380).

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

129215311020 is a wasteful number, since it uses less digits than its factorization.

129215311020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63165 (or 63157 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

Adding to 129215311020 its reverse (20113512921), we get a palindrome (149328823941).

The spelling of 129215311020 in words is "one hundred twenty-nine billion, two hundred fifteen million, three hundred eleven thousand, twenty".