12022221221 has 4 divisors (see below), whose sum is σ = 12022441344. Its totient is φ = 12022001100.

The previous prime is 12022221203. The next prime is 12022221241. The reversal of 12022221221 is 12212222021.

It is a happy number.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12022221221 - 2⁶ = 12022221157 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 12022221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12022221241) 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, 40706 + ... + 160316.

It is an arithmetic number, because the mean of its divisors is an integer number (3005610336).

Almost surely, 2^12022221221 is an apocalyptic number.

It is an amenable number.

12022221221 is a deficient number, since it is larger than the sum of its proper divisors (220123).

12022221221 is a wasteful number, since it uses less digits than its factorization.

12022221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220122.

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

Adding to 12022221221 its reverse (12212222021), we get a palindrome (24234443242).

The spelling of 12022221221 in words is "twelve billion, twenty-two million, two hundred twenty-one thousand, two hundred twenty-one".