1212311213123 has 2 divisors, whose sum is σ = 1212311213124. Its totient is φ = 1212311213122.

The previous prime is 1212311212997. The next prime is 1212311213159. The reversal of 1212311213123 is 3213121132121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1212311213123 - 2³⁰ = 1211237471299 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212311213923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606155606561 + 606155606562.

It is an arithmetic number, because the mean of its divisors is an integer number (606155606562).

Almost surely, 2^{1212311213123} is an apocalyptic number.

1212311213123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212311213123 is an equidigital number, since it uses as much as digits as its factorization.

1212311213123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 23.

Adding to 1212311213123 its reverse (3213121132121), we get a palindrome (4425432345244).

The spelling of 1212311213123 in words is "one trillion, two hundred twelve billion, three hundred eleven million, two hundred thirteen thousand, one hundred twenty-three".