12123012112 has 20 divisors (see below), whose sum is σ = 24123157036. Its totient is φ = 5897681280.

The previous prime is 12123012101. The next prime is 12123012119. The reversal of 12123012112 is 21121032121.

It can be written as a sum of positive squares in 2 ways, for example, as 7157836816 + 4965175296 = 84604^2 + 70464^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (12123012119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10238439 + ... + 10239622.

Almost surely, 2^12123012112 is an apocalyptic number.

It is an amenable number.

12123012112 is a deficient number, since it is larger than the sum of its proper divisors (12000144924).

12123012112 is a wasteful number, since it uses less digits than its factorization.

12123012112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20478106 (or 20478100 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12123012112 its reverse (21121032121), we get a palindrome (33244044233).

The spelling of 12123012112 in words is "twelve billion, one hundred twenty-three million, twelve thousand, one hundred twelve".