13143321 has 6 divisors (see below), whose sum is σ = 18984810. Its totient is φ = 8762208.

The previous prime is 13143313. The next prime is 13143343. The reversal of 13143321 is 12334131.

It can be written as a sum of positive squares in only one way, i.e., 7209225 + 5934096 = 2685^2 + 2436^2 .

It is not a de Polignac number, because 13143321 - 2³ = 13143313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13143294 and 13143303.

It is not an unprimeable number, because it can be changed into a prime (13143301) 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, 730176 + ... + 730193.

It is an arithmetic number, because the mean of its divisors is an integer number (3164135).

Almost surely, 2^13143321 is an apocalyptic number.

It is an amenable number.

13143321 is a deficient number, since it is larger than the sum of its proper divisors (5841489).

13143321 is a wasteful number, since it uses less digits than its factorization.

13143321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460375 (or 1460372 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 13143321 is about 3625.3718429976. The cubic root of 13143321 is about 235.9944040136.

Adding to 13143321 its reverse (12334131), we get a palindrome (25477452).

The spelling of 13143321 in words is "thirteen million, one hundred forty-three thousand, three hundred twenty-one".