1213112112 has 120 divisors (see below), whose sum is σ = 3395358576. Its totient is φ = 371933184.

The previous prime is 1213112083. The next prime is 1213112113. The reversal of 1213112112 is 2112113121.

It is a super-2 number, since 2×1213112112² = 2943281992562201088, which contains 22 as substring.

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 = 1213112091 and 1213112100.

It is not an unprimeable number, because it can be changed into a prime (1213112113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1802208 + ... + 1802880.

Almost surely, 2^1213112112 is an apocalyptic number.

1213112112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213112112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1697679288).

1213112112 is an abundant number, since it is smaller than the sum of its proper divisors (2182246464).

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

1213112112 is a wasteful number, since it uses less digits than its factorization.

1213112112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795 (or 742 counting only the distinct ones).

The product of its digits is 24, while the sum is 15.

The square root of 1213112112 is about 34829.7590000275. The cubic root of 1213112112 is about 1066.5150286177.

Adding to 1213112112 its reverse (2112113121), we get a palindrome (3325225233).

The spelling of 1213112112 in words is "one billion, two hundred thirteen million, one hundred twelve thousand, one hundred twelve".