12200012221 has 4 divisors (see below), whose sum is σ = 12337091100. Its totient is φ = 12062933344.

The previous prime is 12200012219. The next prime is 12200012249. The reversal of 12200012221 is 12221000221.

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: 12221000221 = 97 ⋅125989693.

It can be written as a sum of positive squares in 2 ways, for example, as 5474372121 + 6725640100 = 73989^2 + 82010^2 .

It is a cyclic number.

It is not a de Polignac number, because 12200012221 - 2¹ = 12200012219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12200012021) 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, 68539306 + ... + 68539483.

It is an arithmetic number, because the mean of its divisors is an integer number (3084272775).

Almost surely, 2^12200012221 is an apocalyptic number.

It is an amenable number.

12200012221 is a deficient number, since it is larger than the sum of its proper divisors (137078879).

12200012221 is an equidigital number, since it uses as much as digits as its factorization.

12200012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137078878.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 12200012221 its reverse (12221000221), we get a palindrome (24421012442).

The spelling of 12200012221 in words is "twelve billion, two hundred million, twelve thousand, two hundred twenty-one".