129821532 has 12 divisors (see below), whose sum is σ = 302916936. Its totient is φ = 43273840.

The previous prime is 129821501. The next prime is 129821543. The reversal of 129821532 is 235128921.

It is a happy number.

129821532 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

129821532 is strictly pandigital in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 129821493 and 129821502.

It is a congruent number.

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, 5409219 + ... + 5409242.

It is an arithmetic number, because the mean of its divisors is an integer number (25243078).

Almost surely, 2^129821532 is an apocalyptic number.

129821532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129821532 is an abundant number, since it is smaller than the sum of its proper divisors (173095404).

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

129821532 is a wasteful number, since it uses less digits than its factorization.

129821532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10818468 (or 10818466 counting only the distinct ones).

The product of its digits is 8640, while the sum is 33.

The square root of 129821532 is about 11393.9252235566. The cubic root of 129821532 is about 506.3477796804.

The spelling of 129821532 in words is "one hundred twenty-nine million, eight hundred twenty-one thousand, five hundred thirty-two".