12201002220221 has 4 divisors (see below), whose sum is σ = 12201762091932. Its totient is φ = 12200242348512.

The previous prime is 12201002220163. The next prime is 12201002220289. The reversal of 12201002220221 is 12202220010221.

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 9069818884996 + 3131183335225 = 3011614^2 + 1769515^2 .

It is a cyclic number.

It is not a de Polignac number, because 12201002220221 - 2³⁸ = 11926124313277 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 12201002220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12201002222221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 379911770 + ... + 379943883.

It is an arithmetic number, because the mean of its divisors is an integer number (3050440522983).

Almost surely, 2^{12201002220221} is an apocalyptic number.

It is an amenable number.

12201002220221 is a deficient number, since it is larger than the sum of its proper divisors (759871711).

12201002220221 is an equidigital number, since it uses as much as digits as its factorization.

12201002220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759871710.

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

Adding to 12201002220221 its reverse (12202220010221), we get a palindrome (24403222230442).

The spelling of 12201002220221 in words is "twelve trillion, two hundred one billion, two million, two hundred twenty thousand, two hundred twenty-one".