12218533 has 4 divisors (see below), whose sum is σ = 12516588. Its totient is φ = 11920480.

The previous prime is 12218527. The next prime is 12218537. The reversal of 12218533 is 33581221.

12218533 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4809249 + 7409284 = 2193^2 + 2722^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12218533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12218498 and 12218507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12218537) 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, 148966 + ... + 149047.

It is an arithmetic number, because the mean of its divisors is an integer number (3129147).

Almost surely, 2^12218533 is an apocalyptic number.

It is an amenable number.

12218533 is a deficient number, since it is larger than the sum of its proper divisors (298055).

12218533 is an equidigital number, since it uses as much as digits as its factorization.

12218533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298054.

The product of its digits is 1440, while the sum is 25.

The square root of 12218533 is about 3495.5018237729. The cubic root of 12218533 is about 230.3242622254.

Adding to 12218533 its reverse (33581221), we get a palindrome (45799754).

The spelling of 12218533 in words is "twelve million, two hundred eighteen thousand, five hundred thirty-three".