12130221 has 4 divisors (see below), whose sum is σ = 16173632. Its totient is φ = 8086812.

The previous prime is 12130169. The next prime is 12130259. The reversal of 12130221 is 12203121.

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 not a de Polignac number, because 12130221 - 2⁷ = 12130093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12130197 and 12130206.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2021701 + ... + 2021706.

It is an arithmetic number, because the mean of its divisors is an integer number (4043408).

Almost surely, 2^12130221 is an apocalyptic number.

It is an amenable number.

12130221 is a deficient number, since it is larger than the sum of its proper divisors (4043411).

12130221 is an equidigital number, since it uses as much as digits as its factorization.

12130221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4043410.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 12130221 is about 3482.8466805187. The cubic root of 12130221 is about 229.7680143574.

Adding to 12130221 its reverse (12203121), we get a palindrome (24333342).

Subtracting 12130221 from its reverse (12203121), we obtain a square (72900 = 270²).

The spelling of 12130221 in words is "twelve million, one hundred thirty thousand, two hundred twenty-one".