12130021 has 4 divisors (see below), whose sum is σ = 12521344. Its totient is φ = 11738700.

The previous prime is 12130007. The next prime is 12130049. The reversal of 12130021 is 12003121.

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 12130021 - 2⁵ = 12129989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12130621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195615 + ... + 195676.

It is an arithmetic number, because the mean of its divisors is an integer number (3130336).

Almost surely, 2^12130021 is an apocalyptic number.

It is an amenable number.

12130021 is a deficient number, since it is larger than the sum of its proper divisors (391323).

12130021 is an equidigital number, since it uses as much as digits as its factorization.

12130021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391322.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 12130021 is about 3482.8179682550. The cubic root of 12130021 is about 229.7667515649.

Adding to 12130021 its reverse (12003121), we get a palindrome (24133142).

The spelling of 12130021 in words is "twelve million, one hundred thirty thousand, twenty-one".