12123440112 has 80 divisors (see below), whose sum is σ = 37898502912. Its totient is φ = 3260083200.

The previous prime is 12123440107. The next prime is 12123440117. The reversal of 12123440112 is 21104432121.

It is an interprime number because it is at equal distance from previous prime (12123440107) and next prime (12123440117).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123440117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1055514 + ... + 1066937.

Almost surely, 2^12123440112 is an apocalyptic number.

12123440112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12123440112 is an abundant number, since it is smaller than the sum of its proper divisors (25775062800).

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

12123440112 is a wasteful number, since it uses less digits than its factorization.

12123440112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2122486 (or 2122480 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 12123440112 its reverse (21104432121), we get a palindrome (33227872233).

The spelling of 12123440112 in words is "twelve billion, one hundred twenty-three million, four hundred forty thousand, one hundred twelve".