12031680121 has 4 divisors (see below), whose sum is σ = 12554796672. Its totient is φ = 11508563572.

The previous prime is 12031680053. The next prime is 12031680131. The reversal of 12031680121 is 12108613021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12031680121 - 2²¹ = 12029582969 is a prime.

It is a super-2 number, since 2×12031680121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12031680131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261558241 + ... + 261558286.

It is an arithmetic number, because the mean of its divisors is an integer number (3138699168).

Almost surely, 2^12031680121 is an apocalyptic number.

It is an amenable number.

12031680121 is a deficient number, since it is larger than the sum of its proper divisors (523116551).

12031680121 is an equidigital number, since it uses as much as digits as its factorization.

12031680121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523116550.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 12031680121 in words is "twelve billion, thirty-one million, six hundred eighty thousand, one hundred twenty-one".