1312111213211 has 2 divisors, whose sum is σ = 1312111213212. Its totient is φ = 1312111213210.

The previous prime is 1312111213169. The next prime is 1312111213213. The reversal of 1312111213211 is 1123121112131.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312111213211 is a prime.

Together with 1312111213213, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1312111213213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656055606605 + 656055606606.

It is an arithmetic number, because the mean of its divisors is an integer number (656055606606).

Almost surely, 2^{1312111213211} is an apocalyptic number.

1312111213211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312111213211 is an equidigital number, since it uses as much as digits as its factorization.

1312111213211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 20.

Adding to 1312111213211 its reverse (1123121112131), we get a palindrome (2435232325342).

The spelling of 1312111213211 in words is "one trillion, three hundred twelve billion, one hundred eleven million, two hundred thirteen thousand, two hundred eleven".