1321342203091 has 2 divisors, whose sum is σ = 1321342203092. Its totient is φ = 1321342203090.

The previous prime is 1321342203089. The next prime is 1321342203109. The reversal of 1321342203091 is 1903022431231.

It is a happy number.

Together with next prime (1321342203109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321342203091 - 2¹ = 1321342203089 is a prime.

Together with 1321342203089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1321342203061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660671101545 + 660671101546.

It is an arithmetic number, because the mean of its divisors is an integer number (660671101546).

Almost surely, 2^{1321342203091} is an apocalyptic number.

1321342203091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321342203091 is an equidigital number, since it uses as much as digits as its factorization.

1321342203091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The spelling of 1321342203091 in words is "one trillion, three hundred twenty-one billion, three hundred forty-two million, two hundred three thousand, ninety-one".