1321307929787 has 4 divisors (see below), whose sum is σ = 1333656602136. Its totient is φ = 1308959257440.

The previous prime is 1321307929729. The next prime is 1321307929789. The reversal of 1321307929787 is 7879297031231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1321307929787 - 2²⁶ = 1321240820923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321307929789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6174336014 + ... + 6174336227.

It is an arithmetic number, because the mean of its divisors is an integer number (333414150534).

Almost surely, 2^{1321307929787} is an apocalyptic number.

1321307929787 is a deficient number, since it is larger than the sum of its proper divisors (12348672349).

1321307929787 is a wasteful number, since it uses less digits than its factorization.

1321307929787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12348672348.

The product of its (nonzero) digits is 8001504, while the sum is 59.

The spelling of 1321307929787 in words is "one trillion, three hundred twenty-one billion, three hundred seven million, nine hundred twenty-nine thousand, seven hundred eighty-seven".