11111112212 has 24 divisors (see below), whose sum is σ = 20792094120. Its totient is φ = 5176985600.

The previous prime is 11111112209. The next prime is 11111112307. The reversal of 11111112212 is 21221111111.

It can be written as a sum of positive squares in 4 ways, for example, as 3968496016 + 7142616196 = 62996^2 + 84514^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 802037 + ... + 815772.

It is an arithmetic number, because the mean of its divisors is an integer number (866337255).

Almost surely, 2^11111112212 is an apocalyptic number.

It is an amenable number.

11111112212 is a deficient number, since it is larger than the sum of its proper divisors (9680981908).

11111112212 is a wasteful number, since it uses less digits than its factorization.

11111112212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1617931 (or 1617929 counting only the distinct ones).

The product of its digits is 8, while the sum is 14.

Adding to 11111112212 its reverse (21221111111), we get a palindrome (32332223323).

The spelling of 11111112212 in words is "eleven billion, one hundred eleven million, one hundred twelve thousand, two hundred twelve".