1311312021121 has 4 divisors (see below), whose sum is σ = 1311633504000. Its totient is φ = 1310990538244.

The previous prime is 1311312021109. The next prime is 1311312021163. The reversal of 1311312021121 is 1211202131131.

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 1311312021121 - 2⁹ = 1311312020609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311312021101) 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, 160735321 + ... + 160743478.

It is an arithmetic number, because the mean of its divisors is an integer number (327908376000).

Almost surely, 2^{1311312021121} is an apocalyptic number.

It is an amenable number.

1311312021121 is a deficient number, since it is larger than the sum of its proper divisors (321482879).

1311312021121 is an equidigital number, since it uses as much as digits as its factorization.

1311312021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321482878.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 1311312021121 its reverse (1211202131131), we get a palindrome (2522514152252).

The spelling of 1311312021121 in words is "one trillion, three hundred eleven billion, three hundred twelve million, twenty-one thousand, one hundred twenty-one".