12012440121 has 24 divisors (see below), whose sum is σ = 19009969056. Its totient is φ = 7249007040.

The previous prime is 12012440113. The next prime is 12012440123. The reversal of 12012440121 is 12104421021.

12012440121 is a `hidden beast` number, since 1 + 201 + 2 + 440 + 1 + 21 = 666.

It is not a de Polignac number, because 12012440121 - 2³ = 12012440113 is a prime.

It is a super-2 number, since 2×12012440121² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12012440094 and 12012440103.

It is not an unprimeable number, because it can be changed into a prime (12012440123) 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, 237315 + ... + 283448.

It is an arithmetic number, because the mean of its divisors is an integer number (792082044).

Almost surely, 2^12012440121 is an apocalyptic number.

12012440121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12012440121 is a deficient number, since it is larger than the sum of its proper divisors (6997528935).

12012440121 is a wasteful number, since it uses less digits than its factorization.

12012440121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521013 (or 521010 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12012440121 its reverse (12104421021), we get a palindrome (24116861142).

The spelling of 12012440121 in words is "twelve billion, twelve million, four hundred forty thousand, one hundred twenty-one".