1321307929729 has 2 divisors, whose sum is σ = 1321307929730. Its totient is φ = 1321307929728.

The previous prime is 1321307929703. The next prime is 1321307929789. The reversal of 1321307929729 is 9279297031231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1305900417600 + 15407512129 = 1142760^2 + 124127^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321307929729 - 2⁹ = 1321307929217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1321307929729.

It is not a weakly prime, because it can be changed into another prime (1321307929789) 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, 660653964864 + 660653964865.

It is an arithmetic number, because the mean of its divisors is an integer number (660653964865).

Almost surely, 2^{1321307929729} is an apocalyptic number.

It is an amenable number.

1321307929729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321307929729 is an equidigital number, since it uses as much as digits as its factorization.

1321307929729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2571912, while the sum is 55.

The spelling of 1321307929729 in words is "one trillion, three hundred twenty-one billion, three hundred seven million, nine hundred twenty-nine thousand, seven hundred twenty-nine".