1312120231121 has 4 divisors (see below), whose sum is σ = 1499565978432. Its totient is φ = 1124674483812.

The previous prime is 1312120231063. The next prime is 1312120231223. The reversal of 1312120231121 is 1211320212131.

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 cyclic number.

It is not a de Polignac number, because 1312120231121 - 2¹⁰ = 1312120230097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1312120231093 and 1312120231102.

It is not an unprimeable number, because it can be changed into a prime (1312120231021) 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, 93722873645 + ... + 93722873658.

It is an arithmetic number, because the mean of its divisors is an integer number (374891494608).

Almost surely, 2^{1312120231121} is an apocalyptic number.

It is an amenable number.

1312120231121 is a deficient number, since it is larger than the sum of its proper divisors (187445747311).

1312120231121 is an equidigital number, since it uses as much as digits as its factorization.

1312120231121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187445747310.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1312120231121 its reverse (1211320212131), we get a palindrome (2523440443252).

The spelling of 1312120231121 in words is "one trillion, three hundred twelve billion, one hundred twenty million, two hundred thirty-one thousand, one hundred twenty-one".