12240213 has 4 divisors (see below), whose sum is σ = 16320288. Its totient is φ = 8160140.

The previous prime is 12240203. The next prime is 12240223. The reversal of 12240213 is 31204221.

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 an interprime number because it is at equal distance from previous prime (12240203) and next prime (12240223).

It is a cyclic number.

It is not a de Polignac number, because 12240213 - 2⁴ = 12240197 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12240192 and 12240201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12240203) 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, 2040033 + ... + 2040038.

It is an arithmetic number, because the mean of its divisors is an integer number (4080072).

Almost surely, 2^12240213 is an apocalyptic number.

It is an amenable number.

12240213 is a deficient number, since it is larger than the sum of its proper divisors (4080075).

12240213 is an equidigital number, since it uses as much as digits as its factorization.

12240213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4080074.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 12240213 is about 3498.6015777736. The cubic root of 12240213 is about 230.4604073077.

Adding to 12240213 its reverse (31204221), we get a palindrome (43444434).

The spelling of 12240213 in words is "twelve million, two hundred forty thousand, two hundred thirteen".