11112221212 has 24 divisors (see below), whose sum is σ = 20729004800. Its totient is φ = 5197052016.

The previous prime is 11112221201. The next prime is 11112221213. The reversal of 11112221212 is 21212221111.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11112221213) 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, 919398 + ... + 931405.

Almost surely, 2^11112221212 is an apocalyptic number.

It is an amenable number.

11112221212 is a deficient number, since it is larger than the sum of its proper divisors (9616783588).

11112221212 is a wasteful number, since it uses less digits than its factorization.

11112221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1850905 (or 1850903 counting only the distinct ones).

The product of its digits is 32, while the sum is 16.

Adding to 11112221212 its reverse (21212221111), we get a palindrome (32324442323).

It can be divided in two parts, 11112 and 221212, that added together give a square (232324 = 482²).

The spelling of 11112221212 in words is "eleven billion, one hundred twelve million, two hundred twenty-one thousand, two hundred twelve".