12001322221 has 16 divisors (see below), whose sum is σ = 13805755776. Its totient is φ = 10219599936.

The previous prime is 12001322147. The next prime is 12001322323. The reversal of 12001322221 is 12222310021.

It is a happy number.

It is not a de Polignac number, because 12001322221 - 2¹¹ = 12001320173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12001322195 and 12001322204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001322821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 663915 + ... + 681751.

It is an arithmetic number, because the mean of its divisors is an integer number (862859736).

Almost surely, 2^12001322221 is an apocalyptic number.

It is an amenable number.

12001322221 is a deficient number, since it is larger than the sum of its proper divisors (1804433555).

12001322221 is a wasteful number, since it uses less digits than its factorization.

12001322221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18468.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 12001322221 its reverse (12222310021), we get a palindrome (24223632242).

The spelling of 12001322221 in words is "twelve billion, one million, three hundred twenty-two thousand, two hundred twenty-one".