12130121021 has 4 divisors (see below), whose sum is σ = 12130423200. Its totient is φ = 12129818844.

The previous prime is 12130120963. The next prime is 12130121063. The reversal of 12130121021 is 12012103121.

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 a de Polignac number, because none of the positive numbers 2^k-12130121021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12130120987 and 12130121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12130121821) 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, 79601 + ... + 174918.

It is an arithmetic number, because the mean of its divisors is an integer number (3032605800).

Almost surely, 2^12130121021 is an apocalyptic number.

It is an amenable number.

12130121021 is a deficient number, since it is larger than the sum of its proper divisors (302179).

12130121021 is an equidigital number, since it uses as much as digits as its factorization.

12130121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302178.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 12130121021 its reverse (12012103121), we get a palindrome (24142224142).

The spelling of 12130121021 in words is "twelve billion, one hundred thirty million, one hundred twenty-one thousand, twenty-one".