1321200313 has 4 divisors (see below), whose sum is σ = 1323959040. Its totient is φ = 1318441588.

The previous prime is 1321200311. The next prime is 1321200379. The reversal of 1321200313 is 3130021231.

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: 3130021231 = 853 ⋅3669427.

It is a cyclic number.

It is not a de Polignac number, because 1321200313 - 2¹ = 1321200311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321200311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1378645 + ... + 1379602.

It is an arithmetic number, because the mean of its divisors is an integer number (330989760).

Almost surely, 2^1321200313 is an apocalyptic number.

It is an amenable number.

1321200313 is a deficient number, since it is larger than the sum of its proper divisors (2758727).

1321200313 is an equidigital number, since it uses as much as digits as its factorization.

1321200313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2758726.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 1321200313 is about 36348.3192596301. The cubic root of 1321200313 is about 1097.2937089764.

Adding to 1321200313 its reverse (3130021231), we get a palindrome (4451221544).

The spelling of 1321200313 in words is "one billion, three hundred twenty-one million, two hundred thousand, three hundred thirteen".