111111212122 has 16 divisors (see below), whose sum is σ = 167530061160. Its totient is φ = 55268526592.

The previous prime is 111111212071. The next prime is 111111212123. The reversal of 111111212122 is 221212111111.

It can be written as a sum of positive squares in 4 ways, for example, as 110263179481 + 848032641 = 332059^2 + 29121^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 111111212096 and 111111212105.

It is not an unprimeable number, because it can be changed into a prime (111111212123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166818 + ... + 500050.

Almost surely, 2^111111212122 is an apocalyptic number.

111111212122 is a deficient number, since it is larger than the sum of its proper divisors (56418849038).

111111212122 is a wasteful number, since it uses less digits than its factorization.

111111212122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334097.

The product of its digits is 16, while the sum is 16.

Adding to 111111212122 its reverse (221212111111), we get a palindrome (332323323233).

The spelling of 111111212122 in words is "one hundred eleven billion, one hundred eleven million, two hundred twelve thousand, one hundred twenty-two".