111212121211241 has 2 divisors, whose sum is σ = 111212121211242. Its totient is φ = 111212121211240.

The previous prime is 111212121211229. The next prime is 111212121211273. The reversal of 111212121211241 is 142112121212111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57053413463641 + 54158707747600 = 7553371^2 + 7359260^2 .

It is a cyclic number.

It is not a de Polignac number, because 111212121211241 - 2¹⁰ = 111212121210217 is a prime.

It is not a weakly prime, because it can be changed into another prime (111212121271241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55606060605620 + 55606060605621.

It is an arithmetic number, because the mean of its divisors is an integer number (55606060605621).

Almost surely, 2^{111212121211241} is an apocalyptic number.

It is an amenable number.

111212121211241 is a deficient number, since it is larger than the sum of its proper divisors (1).

111212121211241 is an equidigital number, since it uses as much as digits as its factorization.

111212121211241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 128, while the sum is 23.

Adding to 111212121211241 its reverse (142112121212111), we get a palindrome (253324242423352).

The spelling of 111212121211241 in words is "one hundred eleven trillion, two hundred twelve billion, one hundred twenty-one million, two hundred eleven thousand, two hundred forty-one".