1321000013191 has 2 divisors, whose sum is σ = 1321000013192. Its totient is φ = 1321000013190.

The previous prime is 1321000013093. The next prime is 1321000013233. The reversal of 1321000013191 is 1913100001231.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321000013191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321000013891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660500006595 + 660500006596.

It is an arithmetic number, because the mean of its divisors is an integer number (660500006596).

Almost surely, 2^{1321000013191} is an apocalyptic number.

1321000013191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321000013191 is an equidigital number, since it uses as much as digits as its factorization.

1321000013191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 22.

The spelling of 1321000013191 in words is "one trillion, three hundred twenty-one billion, thirteen thousand, one hundred ninety-one".