11111221127 has 2 divisors, whose sum is σ = 11111221128. Its totient is φ = 11111221126.

The previous prime is 11111221123. The next prime is 11111221139. The reversal of 11111221127 is 72112211111.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (72112211111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11111221127 - 2² = 11111221123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11111221099 and 11111221108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11111221123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555610563 + 5555610564.

It is an arithmetic number, because the mean of its divisors is an integer number (5555610564).

Almost surely, 2^11111221127 is an apocalyptic number.

11111221127 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111221127 is an equidigital number, since it uses as much as digits as its factorization.

11111221127 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56, while the sum is 20.

Adding to 11111221127 its reverse (72112211111), we get a palindrome (83223432238).

The spelling of 11111221127 in words is "eleven billion, one hundred eleven million, two hundred twenty-one thousand, one hundred twenty-seven".