20111122127111 has 2 divisors, whose sum is σ = 20111122127112. Its totient is φ = 20111122127110.

The previous prime is 20111122127017. The next prime is 20111122127141. The reversal of 20111122127111 is 11172122111102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20111122127111 - 2³⁴ = 20093942257927 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111122127141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055561063555 + 10055561063556.

It is an arithmetic number, because the mean of its divisors is an integer number (10055561063556).

Almost surely, 2^{20111122127111} is an apocalyptic number.

20111122127111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111122127111 is an equidigital number, since it uses as much as digits as its factorization.

20111122127111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 23.

Adding to 20111122127111 its reverse (11172122111102), we get a palindrome (31283244238213).

The spelling of 20111122127111 in words is "twenty trillion, one hundred eleven billion, one hundred twenty-two million, one hundred twenty-seven thousand, one hundred eleven".