1212111112 has 16 divisors (see below), whose sum is σ = 2276711100. Its totient is φ = 604988160.

The previous prime is 1212111097. The next prime is 1212111119. The reversal of 1212111112 is 2111112121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1164583876 + 47527236 = 34126^2 + 6894^2 .

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1212111092 and 1212111101.

It is not an unprimeable number, because it can be changed into a prime (1212111119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128589 + ... + 137692.

Almost surely, 2^1212111112 is an apocalyptic number.

It is an amenable number.

1212111112 is a deficient number, since it is larger than the sum of its proper divisors (1064599988).

1212111112 is a wasteful number, since it uses less digits than its factorization.

1212111112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266856 (or 266852 counting only the distinct ones).

The product of its digits is 8, while the sum is 13.

The square root of 1212111112 is about 34815.3861388898. The cubic root of 1212111112 is about 1066.2216027789.

Adding to 1212111112 its reverse (2111112121), we get a palindrome (3323223233).

It can be divided in two parts, 121 and 2111112, that multiplied together give a palindrome (255444552).

The spelling of 1212111112 in words is "one billion, two hundred twelve million, one hundred eleven thousand, one hundred twelve".