111221220212 has 24 divisors (see below), whose sum is σ = 197852123112. Its totient is φ = 54692265600.

The previous prime is 111221220211. The next prime is 111221220251. The reversal of 111221220212 is 212022122111.

It can be written as a sum of positive squares in 4 ways, for example, as 2972176 + 111218248036 = 1724^2 + 333494^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221220211) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2402678 + ... + 2448530.

It is an arithmetic number, because the mean of its divisors is an integer number (8243838463).

Almost surely, 2^111221220212 is an apocalyptic number.

It is an amenable number.

111221220212 is a deficient number, since it is larger than the sum of its proper divisors (86630902900).

111221220212 is a wasteful number, since it uses less digits than its factorization.

111221220212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55859 (or 55857 counting only the distinct ones).

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

Adding to 111221220212 its reverse (212022122111), we get a palindrome (323243342323).

The spelling of 111221220212 in words is "one hundred eleven billion, two hundred twenty-one million, two hundred twenty thousand, two hundred twelve".