1312134221 has 2 divisors, whose sum is σ = 1312134222. Its totient is φ = 1312134220.

The previous prime is 1312134181. The next prime is 1312134223. The reversal of 1312134221 is 1224312131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1252381321 + 59752900 = 35389^2 + 7730^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312134221 - 2¹⁸ = 1311872077 is a prime.

Together with 1312134223, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1312134193 and 1312134202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312134223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656067110 + 656067111.

It is an arithmetic number, because the mean of its divisors is an integer number (656067111).

Almost surely, 2^1312134221 is an apocalyptic number.

It is an amenable number.

1312134221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312134221 is an equidigital number, since it uses as much as digits as its factorization.

1312134221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 20.

The square root of 1312134221 is about 36223.3932838987. The cubic root of 1312134221 is about 1094.7780652914.

Adding to 1312134221 its reverse (1224312131), we get a palindrome (2536446352).

The spelling of 1312134221 in words is "one billion, three hundred twelve million, one hundred thirty-four thousand, two hundred twenty-one".