11111116111321 has 2 divisors, whose sum is σ = 11111116111322. Its totient is φ = 11111116111320.

The previous prime is 11111116111279. The next prime is 11111116111357. The reversal of 11111116111321 is 12311161111111.

It is a m-pointer prime, because the next prime (11111116111357) can be obtained adding 11111116111321 to its product of digits (36).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8966461304025 + 2144654807296 = 2994405^2 + 1464464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11111116111321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11111116111292 and 11111116111301.

It is not a weakly prime, because it can be changed into another prime (11111116111421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555558055660 + 5555558055661.

It is an arithmetic number, because the mean of its divisors is an integer number (5555558055661).

Almost surely, 2^{11111116111321} is an apocalyptic number.

It is an amenable number.

11111116111321 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111116111321 is an equidigital number, since it uses as much as digits as its factorization.

11111116111321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36, while the sum is 22.

Adding to 11111116111321 its reverse (12311161111111), we get a palindrome (23422277222432).

The spelling of 11111116111321 in words is "eleven trillion, one hundred eleven billion, one hundred sixteen million, one hundred eleven thousand, three hundred twenty-one".