1111212313121 has 2 divisors, whose sum is σ = 1111212313122. Its totient is φ = 1111212313120.

The previous prime is 1111212313109. The next prime is 1111212313193. The reversal of 1111212313121 is 1213132121111.

It is a m-pointer prime, because the next prime (1111212313193) can be obtained adding 1111212313121 to its product of digits (72).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 675527829025 + 435684484096 = 821905^2 + 660064^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111212313121 - 2³⁸ = 836334406177 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1111212313093 and 1111212313102.

It is not a weakly prime, because it can be changed into another prime (1111212313921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555606156560 + 555606156561.

It is an arithmetic number, because the mean of its divisors is an integer number (555606156561).

Almost surely, 2^{1111212313121} is an apocalyptic number.

It is an amenable number.

1111212313121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111212313121 is an equidigital number, since it uses as much as digits as its factorization.

1111212313121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 20.

Adding to 1111212313121 its reverse (1213132121111), we get a palindrome (2324344434232).

It can be divided in two parts, 111121 and 2313121, that added together give a palindrome (2424242).

The spelling of 1111212313121 in words is "one trillion, one hundred eleven billion, two hundred twelve million, three hundred thirteen thousand, one hundred twenty-one".