1311321233121 has 16 divisors (see below), whose sum is σ = 1761693268224. Its totient is φ = 867585320064.

The previous prime is 1311321233113. The next prime is 1311321233137. The reversal of 1311321233121 is 1213321231131.

It is not a de Polignac number, because 1311321233121 - 2³ = 1311321233113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1311321233091 and 1311321233100.

It is not an unprimeable number, because it can be changed into a prime (1311321232121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 991896 + ... + 1899078.

It is an arithmetic number, because the mean of its divisors is an integer number (110105829264).

Almost surely, 2^{1311321233121} is an apocalyptic number.

It is an amenable number.

1311321233121 is a deficient number, since it is larger than the sum of its proper divisors (450372035103).

1311321233121 is a wasteful number, since it uses less digits than its factorization.

1311321233121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910840.

The product of its digits is 648, while the sum is 24.

Adding to 1311321233121 its reverse (1213321231131), we get a palindrome (2524642464252).

The spelling of 1311321233121 in words is "one trillion, three hundred eleven billion, three hundred twenty-one million, two hundred thirty-three thousand, one hundred twenty-one".