1211320023191 has 2 divisors, whose sum is σ = 1211320023192. Its totient is φ = 1211320023190.

The previous prime is 1211320023139. The next prime is 1211320023211. The reversal of 1211320023191 is 1913200231121.

It is a strong prime.

It is an emirp because it is prime and its reverse (1913200231121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211320023191 - 2⁶ = 1211320023127 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211320023191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211320023691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605660011595 + 605660011596.

It is an arithmetic number, because the mean of its divisors is an integer number (605660011596).

Almost surely, 2^{1211320023191} is an apocalyptic number.

1211320023191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211320023191 is an equidigital number, since it uses as much as digits as its factorization.

1211320023191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 26.

The spelling of 1211320023191 in words is "one trillion, two hundred eleven billion, three hundred twenty million, twenty-three thousand, one hundred ninety-one".