111212212112 has 20 divisors (see below), whose sum is σ = 215484564876. Its totient is φ = 55603292160.

The previous prime is 111212212109. The next prime is 111212212129. The reversal of 111212212112 is 211212212111.

It can be written as a sum of positive squares in 2 ways, for example, as 892575376 + 110319636736 = 29876^2 + 332144^2 .

It is a super-2 number, since 2×111212212112² (a number of 23 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170912 + ... + 501632.

Almost surely, 2^111212212112 is an apocalyptic number.

It is an amenable number.

111212212112 is a deficient number, since it is larger than the sum of its proper divisors (104272352764).

111212212112 is a wasteful number, since it uses less digits than its factorization.

111212212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351746 (or 351740 counting only the distinct ones).

The product of its digits is 32, while the sum is 17.

Adding to 111212212112 its reverse (211212212111), we get a palindrome (322424424223).

Subtracting 111212212112 from its reverse (211212212111), we obtain a palindrome (99999999999).

The spelling of 111212212112 in words is "one hundred eleven billion, two hundred twelve million, two hundred twelve thousand, one hundred twelve".