12212513 has 4 divisors (see below), whose sum is σ = 12229908. Its totient is φ = 12195120.

The previous prime is 12212507. The next prime is 12212521. The reversal of 12212513 is 31521221.

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: 31521221 = 409 ⋅77069.

It can be written as a sum of positive squares in 2 ways, for example, as 9690769 + 2521744 = 3113^2 + 1588^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12212513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12212491 and 12212500.

It is not an unprimeable number, because it can be changed into a prime (12212503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7598 + ... + 9063.

It is an arithmetic number, because the mean of its divisors is an integer number (3057477).

Almost surely, 2^12212513 is an apocalyptic number.

It is an amenable number.

12212513 is a deficient number, since it is larger than the sum of its proper divisors (17395).

12212513 is an equidigital number, since it uses as much as digits as its factorization.

12212513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17394.

The product of its digits is 120, while the sum is 17.

The square root of 12212513 is about 3494.6406109928. The cubic root of 12212513 is about 230.2864295375.

Adding to 12212513 its reverse (31521221), we get a palindrome (43733734).

The spelling of 12212513 in words is "twelve million, two hundred twelve thousand, five hundred thirteen".