1321078013 has 2 divisors, whose sum is σ = 1321078014. Its totient is φ = 1321078012.

The previous prime is 1321077971. The next prime is 1321078039. The reversal of 1321078013 is 3108701231.

It is an a-pointer prime, because the next prime (1321078039) can be obtained adding 1321078013 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1213686244 + 107391769 = 34838^2 + 10363^2 .

It is an emirp because it is prime and its reverse (3108701231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321078013 - 2⁸ = 1321077757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321078513) 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, 660539006 + 660539007.

It is an arithmetic number, because the mean of its divisors is an integer number (660539007).

Almost surely, 2^1321078013 is an apocalyptic number.

It is an amenable number.

1321078013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321078013 is an equidigital number, since it uses as much as digits as its factorization.

1321078013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 1321078013 is about 36346.6368870629. The cubic root of 1321078013 is about 1097.2598500779.

Adding to 1321078013 its reverse (3108701231), we get a palindrome (4429779244).

The spelling of 1321078013 in words is "one billion, three hundred twenty-one million, seventy-eight thousand, thirteen".