1312021233209 has 4 divisors (see below), whose sum is σ = 1312035267060. Its totient is φ = 1312007199360.

The previous prime is 1312021233163. The next prime is 1312021233221. The reversal of 1312021233209 is 9023321202131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 339288775225 + 972732457984 = 582485^2 + 986272^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312021233209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312021230209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6875744 + ... + 7063985.

It is an arithmetic number, because the mean of its divisors is an integer number (328008816765).

Almost surely, 2^{1312021233209} is an apocalyptic number.

It is an amenable number.

1312021233209 is a deficient number, since it is larger than the sum of its proper divisors (14033851).

1312021233209 is an equidigital number, since it uses as much as digits as its factorization.

1312021233209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14033850.

The product of its (nonzero) digits is 3888, while the sum is 29.

The spelling of 1312021233209 in words is "one trillion, three hundred twelve billion, twenty-one million, two hundred thirty-three thousand, two hundred nine".