111101212111 has 2 divisors, whose sum is σ = 111101212112. Its totient is φ = 111101212110.

The previous prime is 111101212049. The next prime is 111101212133. The reversal of 111101212111 is 111212101111.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111101212111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111101212091 and 111101212100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111101212141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55550606055 + 55550606056.

It is an arithmetic number, because the mean of its divisors is an integer number (55550606056).

Almost surely, 2^111101212111 is an apocalyptic number.

111101212111 is a deficient number, since it is larger than the sum of its proper divisors (1).

111101212111 is an equidigital number, since it uses as much as digits as its factorization.

111101212111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 111101212111 its reverse (111212101111), we get a palindrome (222313313222).

It can be divided in two parts, 11110 and 1212111, that added together give a palindrome (1223221).

The spelling of 111101212111 in words is "one hundred eleven billion, one hundred one million, two hundred twelve thousand, one hundred eleven".