111212220212 has 36 divisors (see below), whose sum is σ = 207711880740. Its totient is φ = 52087508352.

The previous prime is 111212220199. The next prime is 111212220277. The reversal of 111212220212 is 212022212111.

It can be written as a sum of positive squares in 2 ways, for example, as 55382091556 + 55830128656 = 235334^2 + 236284^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 304163 + ... + 561194.

It is an arithmetic number, because the mean of its divisors is an integer number (5769774465).

Almost surely, 2^111212220212 is an apocalyptic number.

It is an amenable number.

111212220212 is a deficient number, since it is larger than the sum of its proper divisors (96499660528).

111212220212 is a wasteful number, since it uses less digits than its factorization.

111212220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865488 (or 865467 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 111212220212 its reverse (212022212111), we get a palindrome (323234432323).

The spelling of 111212220212 in words is "one hundred eleven billion, two hundred twelve million, two hundred twenty thousand, two hundred twelve".