1321886394989 has 2 divisors, whose sum is σ = 1321886394990. Its totient is φ = 1321886394988.

The previous prime is 1321886394977. The next prime is 1321886394991. The reversal of 1321886394989 is 9894936881231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1090677366025 + 231209028964 = 1044355^2 + 480842^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321886394989 - 2⁴ = 1321886394973 is a prime.

It is a Sophie Germain prime.

Together with 1321886394991, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321886894989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660943197494 + 660943197495.

It is an arithmetic number, because the mean of its divisors is an integer number (660943197495).

Almost surely, 2^{1321886394989} is an apocalyptic number.

It is an amenable number.

1321886394989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321886394989 is an equidigital number, since it uses as much as digits as its factorization.

1321886394989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161243136, while the sum is 71.

The spelling of 1321886394989 in words is "one trillion, three hundred twenty-one billion, eight hundred eighty-six million, three hundred ninety-four thousand, nine hundred eighty-nine".