12213210221 has 4 divisors (see below), whose sum is σ = 12413426844. Its totient is φ = 12012993600.

The previous prime is 12213210211. The next prime is 12213210223. The reversal of 12213210221 is 12201231221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12201231221 = 479 ⋅25472299.

It can be written as a sum of positive squares in 2 ways, for example, as 6138722500 + 6074487721 = 78350^2 + 77939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12213210221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12213210221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12213210223) 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, 100108220 + ... + 100108341.

It is an arithmetic number, because the mean of its divisors is an integer number (3103356711).

Almost surely, 2^12213210221 is an apocalyptic number.

It is an amenable number.

12213210221 is a deficient number, since it is larger than the sum of its proper divisors (200216623).

12213210221 is an equidigital number, since it uses as much as digits as its factorization.

12213210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200216622.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 12213210221 its reverse (12201231221), we get a palindrome (24414441442).

The spelling of 12213210221 in words is "twelve billion, two hundred thirteen million, two hundred ten thousand, two hundred twenty-one".