11111121271 has 2 divisors, whose sum is σ = 11111121272. Its totient is φ = 11111121270.

The previous prime is 11111121247. The next prime is 11111121289. The reversal of 11111121271 is 17212111111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11111121271 - 2⁹ = 11111120759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11111121211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555560635 + 5555560636.

It is an arithmetic number, because the mean of its divisors is an integer number (5555560636).

Almost surely, 2^11111121271 is an apocalyptic number.

11111121271 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111121271 is an equidigital number, since it uses as much as digits as its factorization.

11111121271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28, while the sum is 19.

Adding to 11111121271 its reverse (17212111111), we get a palindrome (28323232382).

The spelling of 11111121271 in words is "eleven billion, one hundred eleven million, one hundred twenty-one thousand, two hundred seventy-one".