12221021221221 has 4 divisors (see below), whose sum is σ = 16294694961632. Its totient is φ = 8147347480812.

The previous prime is 12221021221219. The next prime is 12221021221223. The reversal of 12221021221221 is 12212212012221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (12221021221219) and next prime (12221021221223).

It is not a de Polignac number, because 12221021221221 - 2¹ = 12221021221219 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 (12221021221223) 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, 2036836870201 + ... + 2036836870206.

It is an arithmetic number, because the mean of its divisors is an integer number (4073673740408).

Almost surely, 2^{12221021221221} is an apocalyptic number.

It is an amenable number.

12221021221221 is a deficient number, since it is larger than the sum of its proper divisors (4073673740411).

12221021221221 is an equidigital number, since it uses as much as digits as its factorization.

12221021221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4073673740410.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 12221021221221 its reverse (12212212012221), we get a palindrome (24433233233442).

The spelling of 12221021221221 in words is "twelve trillion, two hundred twenty-one billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".