1321123111211 has 2 divisors, whose sum is σ = 1321123111212. Its totient is φ = 1321123111210.

The previous prime is 1321123111199. The next prime is 1321123111283. The reversal of 1321123111211 is 1121113211231.

It is a m-pointer prime, because the next prime (1321123111283) can be obtained adding 1321123111211 to its product of digits (72).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321123111211 - 2¹⁴ = 1321123094827 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321123111811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660561555605 + 660561555606.

It is an arithmetic number, because the mean of its divisors is an integer number (660561555606).

Almost surely, 2^{1321123111211} is an apocalyptic number.

1321123111211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321123111211 is an equidigital number, since it uses as much as digits as its factorization.

1321123111211 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 1321123111211 its reverse (1121113211231), we get a palindrome (2442236322442).

The spelling of 1321123111211 in words is "one trillion, three hundred twenty-one billion, one hundred twenty-three million, one hundred eleven thousand, two hundred eleven".