129321 has 6 divisors (see below), whose sum is σ = 186810. Its totient is φ = 86208.

The previous prime is 129313. The next prime is 129341. The reversal of 129321 is 123921.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 114921 + 14400 = 339^2 + 120^2 .

It is not a de Polignac number, because 129321 - 2³ = 129313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129294 and 129303.

It is not an unprimeable number, because it can be changed into a prime (129341) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7176 + ... + 7193.

It is an arithmetic number, because the mean of its divisors is an integer number (31135).

2¹²⁹³²¹ is an apocalyptic number.

It is an amenable number.

129321 is a deficient number, since it is larger than the sum of its proper divisors (57489).

129321 is a wasteful number, since it uses less digits than its factorization.

129321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14375 (or 14372 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 129321 is about 359.6122912249. The cubic root of 129321 is about 50.5696193659.

The spelling of 129321 in words is "one hundred twenty-nine thousand, three hundred twenty-one".