1312111211121 has 20 divisors (see below), whose sum is σ = 2045287687872. Its totient is φ = 836708597208.

The previous prime is 1312111211119. The next prime is 1312111211129. The reversal of 1312111211121 is 1211121112131.

It is not a de Polignac number, because 1312111211121 - 2¹ = 1312111211119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1312111211094 and 1312111211103.

It is not an unprimeable number, because it can be changed into a prime (1312111211129) 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 19 ways as a sum of consecutive naturals, for example, 352148221 + ... + 352151946.

Almost surely, 2^{1312111211121} is an apocalyptic number.

It is an amenable number.

1312111211121 is a deficient number, since it is larger than the sum of its proper divisors (733176476751).

1312111211121 is an equidigital number, since it uses as much as digits as its factorization.

1312111211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704300202 (or 704300193 counting only the distinct ones).

The product of its digits is 24, while the sum is 18.

Adding to 1312111211121 its reverse (1211121112131), we get a palindrome (2523232323252).

The spelling of 1312111211121 in words is "one trillion, three hundred twelve billion, one hundred eleven million, two hundred eleven thousand, one hundred twenty-one".