1321098013 has 4 divisors (see below), whose sum is σ = 1323121788. Its totient is φ = 1319074240.

The previous prime is 1321098011. The next prime is 1321098019. The reversal of 1321098013 is 3108901231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3108901231 = 17 ⋅182876543.

It can be written as a sum of positive squares in 2 ways, for example, as 651168324 + 669929689 = 25518^2 + 25883^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321098013 - 2¹ = 1321098011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321098011) 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 in 3 ways as a sum of consecutive naturals, for example, 1010908 + ... + 1012213.

It is an arithmetic number, because the mean of its divisors is an integer number (330780447).

Almost surely, 2^1321098013 is an apocalyptic number.

It is an amenable number.

1321098013 is a deficient number, since it is larger than the sum of its proper divisors (2023775).

1321098013 is an equidigital number, since it uses as much as digits as its factorization.

1321098013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023774.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1321098013 is about 36346.9120146403. The cubic root of 1321098013 is about 1097.2653872443.

Adding to 1321098013 its reverse (3108901231), we get a palindrome (4429999244).

The spelling of 1321098013 in words is "one billion, three hundred twenty-one million, ninety-eight thousand, thirteen".