12221323021 has 4 divisors (see below), whose sum is σ = 12264508192. Its totient is φ = 12178137852.

The previous prime is 12221322991. The next prime is 12221323141. The reversal of 12221323021 is 12032312221.

12221323021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12032312221 = 47 ⋅256006643.

It is a cyclic number.

It is not a de Polignac number, because 12221323021 - 2²³ = 12212934413 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 12221323021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221323421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21592161 + ... + 21592726.

It is an arithmetic number, because the mean of its divisors is an integer number (3066127048).

Almost surely, 2^12221323021 is an apocalyptic number.

It is an amenable number.

12221323021 is a deficient number, since it is larger than the sum of its proper divisors (43185171).

12221323021 is an equidigital number, since it uses as much as digits as its factorization.

12221323021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43185170.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 12221323021 its reverse (12032312221), we get a palindrome (24253635242).

The spelling of 12221323021 in words is "twelve billion, two hundred twenty-one million, three hundred twenty-three thousand, twenty-one".