12130423021 has 4 divisors (see below), whose sum is σ = 12548713500. Its totient is φ = 11712132544.

The previous prime is 12130423013. The next prime is 12130423033. The reversal of 12130423021 is 12032403121.

It is a happy number.

12130423021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12032403121 = 97 ⋅124045393.

It can be written as a sum of positive squares in 2 ways, for example, as 2485022500 + 9645400521 = 49850^2 + 98211^2 .

It is a cyclic number.

It is not a de Polignac number, because 12130423021 - 2³ = 12130423013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12130423021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12130423001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209145196 + ... + 209145253.

It is an arithmetic number, because the mean of its divisors is an integer number (3137178375).

Almost surely, 2^12130423021 is an apocalyptic number.

It is an amenable number.

12130423021 is a deficient number, since it is larger than the sum of its proper divisors (418290479).

12130423021 is an equidigital number, since it uses as much as digits as its factorization.

12130423021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418290478.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 12130423021 its reverse (12032403121), we get a palindrome (24162826142).

The spelling of 12130423021 in words is "twelve billion, one hundred thirty million, four hundred twenty-three thousand, twenty-one".