12819321 has 6 divisors (see below), whose sum is σ = 18516810. Its totient is φ = 8546208.

The previous prime is 12819197. The next prime is 12819329. The reversal of 12819321 is 12391821.

It can be written as a sum of positive squares in only one way, i.e., 10890000 + 1929321 = 3300^2 + 1389^2 .

It is not a de Polignac number, because 12819321 - 2¹⁰ = 12818297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12819329) 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, 712176 + ... + 712193.

It is an arithmetic number, because the mean of its divisors is an integer number (3086135).

Almost surely, 2^12819321 is an apocalyptic number.

It is an amenable number.

12819321 is a deficient number, since it is larger than the sum of its proper divisors (5697489).

12819321 is a wasteful number, since it uses less digits than its factorization.

12819321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1424375 (or 1424372 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 12819321 is about 3580.4079376518. The cubic root of 12819321 is about 234.0390576925.

The spelling of 12819321 in words is "twelve million, eight hundred nineteen thousand, three hundred twenty-one".