111212011220211 has 12 divisors (see below), whose sum is σ = 175243169195640. Its totient is φ = 67401218921280.

The previous prime is 111212011220197. The next prime is 111212011220237. The reversal of 111212011220211 is 112022110212111.

It is a happy number.

111212011220211 is a `hidden beast` number, since 1 + 11 + 21 + 201 + 1 + 220 + 211 = 666.

It is not a de Polignac number, because 111212011220211 - 2²³ = 111212002831603 is a prime.

It is a super-2 number, since 2×111212011220211² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (111212011220251) 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 11 ways as a sum of consecutive naturals, for example, 561676824246 + ... + 561676824443.

It is an arithmetic number, because the mean of its divisors is an integer number (14603597432970).

Almost surely, 2^{111212011220211} is an apocalyptic number.

111212011220211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111212011220211 is a deficient number, since it is larger than the sum of its proper divisors (64031157975429).

111212011220211 is a wasteful number, since it uses less digits than its factorization.

111212011220211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123353648706 (or 1123353648703 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 111212011220211 its reverse (112022110212111), we get a palindrome (223234121432322).

The spelling of 111212011220211 in words is "one hundred eleven trillion, two hundred twelve billion, eleven million, two hundred twenty thousand, two hundred eleven".