111111212220012 has 288 divisors, whose sum is σ = 293703309454464. Its totient is φ = 35387269632000.

The previous prime is 111111212219993. The next prime is 111111212220079. The reversal of 111111212220012 is 210022212111111.

It is a happy number.

111111212220012 is a `hidden beast` number, since 111 + 111 + 212 + 220 + 0 + 12 = 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 pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 11222216262 + ... + 11222226162.

It is an arithmetic number, because the mean of its divisors is an integer number (1019803157828).

Almost surely, 2^{111111212220012} is an apocalyptic number.

111111212220012 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 111111212220012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146851654727232).

111111212220012 is an abundant number, since it is smaller than the sum of its proper divisors (182592097234452).

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

111111212220012 is a wasteful number, since it uses less digits than its factorization.

111111212220012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10729 (or 10724 counting only the distinct ones).

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

Adding to 111111212220012 its reverse (210022212111111), we get a palindrome (321133424331123).

The spelling of 111111212220012 in words is "one hundred eleven trillion, one hundred eleven billion, two hundred twelve million, two hundred twenty thousand, twelve".