111212220112111 has 2 divisors, whose sum is σ = 111212220112112. Its totient is φ = 111212220112110.

The previous prime is 111212220112073. The next prime is 111212220112127. The reversal of 111212220112111 is 111211022212111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111212220112111 - 2¹⁷ = 111212219981039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111212220112151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55606110056055 + 55606110056056.

It is an arithmetic number, because the mean of its divisors is an integer number (55606110056056).

Almost surely, 2^{111212220112111} is an apocalyptic number.

111212220112111 is a deficient number, since it is larger than the sum of its proper divisors (1).

111212220112111 is an equidigital number, since it uses as much as digits as its factorization.

111212220112111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 111212220112111 its reverse (111211022212111), we get a palindrome (222423242324222).

The spelling of 111212220112111 in words is "one hundred eleven trillion, two hundred twelve billion, two hundred twenty million, one hundred twelve thousand, one hundred eleven".