12221002121021 has 4 divisors (see below), whose sum is σ = 12250030630044. Its totient is φ = 12191973612000.

The previous prime is 12221002121017. The next prime is 12221002121059. The reversal of 12221002121021 is 12012120012221.

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 3178682488996 + 9042319632025 = 1782886^2 + 3007045^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221002121021 - 2² = 12221002121017 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 (12221002121071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14514253880 + ... + 14514254721.

It is an arithmetic number, because the mean of its divisors is an integer number (3062507657511).

Almost surely, 2^{12221002121021} is an apocalyptic number.

It is an amenable number.

12221002121021 is a deficient number, since it is larger than the sum of its proper divisors (29028509023).

12221002121021 is an equidigital number, since it uses as much as digits as its factorization.

12221002121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29028509022.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12221002121021 its reverse (12012120012221), we get a palindrome (24233122133242).

The spelling of 12221002121021 in words is "twelve trillion, two hundred twenty-one billion, two million, one hundred twenty-one thousand, twenty-one".