111111121210212 has 144 divisors (see below), whose sum is σ = 287050687035840. Its totient is φ = 36229488793344.

The previous prime is 111111121210189. The next prime is 111111121210237. The reversal of 111111121210212 is 212012121111111.

111111121210212 is a `hidden beast` number, since 1 + 11 + 111 + 121 + 210 + 212 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 345761203 + ... + 346082405.

It is an arithmetic number, because the mean of its divisors is an integer number (1993407548860).

Almost surely, 2^{111111121210212} is an apocalyptic number.

111111121210212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111111121210212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143525343517920).

111111121210212 is an abundant number, since it is smaller than the sum of its proper divisors (175939565825628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111111121210212 is a wasteful number, since it uses less digits than its factorization.

111111121210212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322282 (or 322277 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 111111121210212 its reverse (212012121111111), we get a palindrome (323123242321323).

The spelling of 111111121210212 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred twenty-one million, two hundred ten thousand, two hundred twelve".