1211111112 has 32 divisors (see below), whose sum is σ = 3032614080. Its totient is φ = 403058880.

The previous prime is 1211111107. The next prime is 1211111117. The reversal of 1211111112 is 2111111121.

It is an interprime number because it is at equal distance from previous prime (1211111107) and next prime (1211111117).

It is a Harshad number since it is a multiple of its sum of digits (12).

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 not an unprimeable number, because it can be changed into a prime (1211111117) 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, 24843 + ... + 55130.

It is an arithmetic number, because the mean of its divisors is an integer number (94769190).

Almost surely, 2^1211111112 is an apocalyptic number.

1211111112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211111112 is an abundant number, since it is smaller than the sum of its proper divisors (1821502968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211111112 is a wasteful number, since it uses less digits than its factorization.

1211111112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80613 (or 80609 counting only the distinct ones).

The product of its digits is 4, while the sum is 12.

The square root of 1211111112 is about 34801.0217091395. The cubic root of 1211111112 is about 1065.9283087236.

Adding to 1211111112 its reverse (2111111121), we get a palindrome (3322222233).

Subtracting 1211111112 from its reverse (2111111121), we obtain a palindrome (900000009).

The spelling of 1211111112 in words is "one billion, two hundred eleven million, one hundred eleven thousand, one hundred twelve".