12158213 has 4 divisors (see below), whose sum is σ = 12873420. Its totient is φ = 11443008.

The previous prime is 12158203. The next prime is 12158219. The reversal of 12158213 is 31285121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31285121 = 7 ⋅4469303.

It can be written as a sum of positive squares in 2 ways, for example, as 7059649 + 5098564 = 2657^2 + 2258^2 .

It is a cyclic number.

It is not a de Polignac number, because 12158213 - 2⁴ = 12158197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12158219) 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, 357578 + ... + 357611.

It is an arithmetic number, because the mean of its divisors is an integer number (3218355).

Almost surely, 2^12158213 is an apocalyptic number.

It is an amenable number.

12158213 is a deficient number, since it is larger than the sum of its proper divisors (715207).

12158213 is an equidigital number, since it uses as much as digits as its factorization.

12158213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715206.

The product of its digits is 480, while the sum is 23.

The square root of 12158213 is about 3486.8629167204. The cubic root of 12158213 is about 229.9446180456.

It can be divided in two parts, 1215821 and 3, that multiplied together give a palindrome (3647463).

The spelling of 12158213 in words is "twelve million, one hundred fifty-eight thousand, two hundred thirteen".