111111121241 has 2 divisors, whose sum is σ = 111111121242. Its totient is φ = 111111121240.

The previous prime is 111111121213. The next prime is 111111121243. The reversal of 111111121241 is 142121111111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62148495616 + 48962625625 = 249296^2 + 221275^2 .

It is a cyclic number.

It is not a de Polignac number, because 111111121241 - 2²² = 111106926937 is a prime.

Together with 111111121243, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111111121243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555560620 + 55555560621.

It is an arithmetic number, because the mean of its divisors is an integer number (55555560621).

Almost surely, 2^111111121241 is an apocalyptic number.

It is an amenable number.

111111121241 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111121241 is an equidigital number, since it uses as much as digits as its factorization.

111111121241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16, while the sum is 17.

Adding to 111111121241 its reverse (142121111111), we get a palindrome (253232232352).

The spelling of 111111121241 in words is "one hundred eleven billion, one hundred eleven million, one hundred twenty-one thousand, two hundred forty-one".