12201220002221 has 4 divisors (see below), whose sum is σ = 12201244338492. Its totient is φ = 12201195665952.

The previous prime is 12201220002199. The next prime is 12201220002277. The reversal of 12201220002221 is 12220002210221.

It is a happy number.

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 9478307486596 + 2722912515625 = 3078686^2 + 1650125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12201220002221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12201220002221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12201220002421) 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, 11399930 + ... + 12424203.

It is an arithmetic number, because the mean of its divisors is an integer number (3050311084623).

Almost surely, 2^{12201220002221} is an apocalyptic number.

It is an amenable number.

12201220002221 is a deficient number, since it is larger than the sum of its proper divisors (24336271).

12201220002221 is an equidigital number, since it uses as much as digits as its factorization.

12201220002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24336270.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 12201220002221 its reverse (12220002210221), we get a palindrome (24421222212442).

The spelling of 12201220002221 in words is "twelve trillion, two hundred one billion, two hundred twenty million, two thousand, two hundred twenty-one".