8129321 has 4 divisors (see below), whose sum is σ = 8557200. Its totient is φ = 7701444.

The previous prime is 8129273. The next prime is 8129323. The reversal of 8129321 is 1239218.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8129321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8129323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213911 + ... + 213948.

It is an arithmetic number, because the mean of its divisors is an integer number (2139300).

Almost surely, 2^8129321 is an apocalyptic number.

It is an amenable number.

8129321 is a deficient number, since it is larger than the sum of its proper divisors (427879).

8129321 is a wasteful number, since it uses less digits than its factorization.

8129321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427878.

The product of its digits is 864, while the sum is 26.

The square root of 8129321 is about 2851.1964155421. The cubic root of 8129321 is about 201.0719196773.

The spelling of 8129321 in words is "eight million, one hundred twenty-nine thousand, three hundred twenty-one".