111212020120111 has 4 divisors (see below), whose sum is σ = 111470052649824. Its totient is φ = 110953987590400.

The previous prime is 111212020120057. The next prime is 111212020120213. The reversal of 111212020120111 is 111021020212111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111212020120111 - 2¹¹ = 111212020118063 is a prime.

It is a super-2 number, since 2×111212020120111² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212020123111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129016264210 + ... + 129016265071.

It is an arithmetic number, because the mean of its divisors is an integer number (27867513162456).

Almost surely, 2^{111212020120111} is an apocalyptic number.

111212020120111 is a deficient number, since it is larger than the sum of its proper divisors (258032529713).

111212020120111 is an equidigital number, since it uses as much as digits as its factorization.

111212020120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258032529712.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 111212020120111 its reverse (111021020212111), we get a palindrome (222233040332222).

The spelling of 111212020120111 in words is "one hundred eleven trillion, two hundred twelve billion, twenty million, one hundred twenty thousand, one hundred eleven".