129835421860 has 12 divisors (see below), whose sum is σ = 272654385948. Its totient is φ = 51934168736.

The previous prime is 129835421857. The next prime is 129835421917. The reversal of 129835421860 is 68124538921.

It can be written as a sum of positive squares in 2 ways, for example, as 90418084416 + 39417337444 = 300696^2 + 198538^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3245885527 + ... + 3245885566.

It is an arithmetic number, because the mean of its divisors is an integer number (22721198829).

Almost surely, 2^129835421860 is an apocalyptic number.

129835421860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129835421860 is an abundant number, since it is smaller than the sum of its proper divisors (142818964088).

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

129835421860 is a wasteful number, since it uses less digits than its factorization.

129835421860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6491771102 (or 6491771100 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 49.

The spelling of 129835421860 in words is "one hundred twenty-nine billion, eight hundred thirty-five million, four hundred twenty-one thousand, eight hundred sixty".