129821502 has 16 divisors (see below), whose sum is σ = 262320912. Its totient is φ = 42827520.

The previous prime is 129821501. The next prime is 129821543. The reversal of 129821502 is 205128921.

It is a self number, because there is not a number n which added to its sum of digits gives 129821502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129821501) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 110949 + ... + 112112.

It is an arithmetic number, because the mean of its divisors is an integer number (16395057).

Almost surely, 2^129821502 is an apocalyptic number.

129821502 is an abundant number, since it is smaller than the sum of its proper divisors (132499410).

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

129821502 is a wasteful number, since it uses less digits than its factorization.

129821502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223163.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 129821502 is about 11393.9239070656. The cubic root of 129821502 is about 506.3477406770.

The spelling of 129821502 in words is "one hundred twenty-nine million, eight hundred twenty-one thousand, five hundred two".