1312201232321 has 4 divisors (see below), whose sum is σ = 1499658551232. Its totient is φ = 1124743913412.

The previous prime is 1312201232263. The next prime is 1312201232351. The reversal of 1312201232321 is 1232321022131.

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.

It is a de Polignac number, because none of the positive numbers 2^k-1312201232321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312201232351) 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, 93728659445 + ... + 93728659458.

It is an arithmetic number, because the mean of its divisors is an integer number (374914637808).

Almost surely, 2^{1312201232321} is an apocalyptic number.

It is an amenable number.

1312201232321 is a deficient number, since it is larger than the sum of its proper divisors (187457318911).

1312201232321 is an equidigital number, since it uses as much as digits as its factorization.

1312201232321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187457318910.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1312201232321 its reverse (1232321022131), we get a palindrome (2544522254452).

The spelling of 1312201232321 in words is "one trillion, three hundred twelve billion, two hundred one million, two hundred thirty-two thousand, three hundred twenty-one".