12131321 has 2 divisors, whose sum is σ = 12131322. Its totient is φ = 12131320.

The previous prime is 12131303. The next prime is 12131347. The reversal of 12131321 is 12313121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12075625 + 55696 = 3475^2 + 236^2 .

It is a cyclic number.

It is not a de Polignac number, because 12131321 - 2⁶ = 12131257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12131296 and 12131305.

It is not a weakly prime, because it can be changed into another prime (12131621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6065660 + 6065661.

It is an arithmetic number, because the mean of its divisors is an integer number (6065661).

Almost surely, 2^12131321 is an apocalyptic number.

It is an amenable number.

12131321 is a deficient number, since it is larger than the sum of its proper divisors (1).

12131321 is an equidigital number, since it uses as much as digits as its factorization.

12131321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36, while the sum is 14.

The square root of 12131321 is about 3483.0045937380. The cubic root of 12131321 is about 229.7749594679.

Adding to 12131321 its reverse (12313121), we get a palindrome (24444442).

The spelling of 12131321 in words is "twelve million, one hundred thirty-one thousand, three hundred twenty-one".