1313212321 has 4 divisors (see below), whose sum is σ = 1314801072. Its totient is φ = 1311623572.

The previous prime is 1313212291. The next prime is 1313212367. The reversal of 1313212321 is 1232123131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1232123131 = 83 ⋅14844857.

It is a cyclic number.

It is not a de Polignac number, because 1313212321 - 2¹⁷ = 1313081249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1313210321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 793135 + ... + 794788.

It is an arithmetic number, because the mean of its divisors is an integer number (328700268).

Almost surely, 2^1313212321 is an apocalyptic number.

It is an amenable number.

1313212321 is a deficient number, since it is larger than the sum of its proper divisors (1588751).

1313212321 is an equidigital number, since it uses as much as digits as its factorization.

1313212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588750.

The product of its digits is 216, while the sum is 19.

The square root of 1313212321 is about 36238.2714957543. The cubic root of 1313212321 is about 1095.0778204807.

Adding to 1313212321 its reverse (1232123131), we get a palindrome (2545335452).

The spelling of 1313212321 in words is "one billion, three hundred thirteen million, two hundred twelve thousand, three hundred twenty-one".