12001232221 has 24 divisors (see below), whose sum is σ = 13460076000. Its totient is φ = 10611849600.

The previous prime is 12001232207. The next prime is 12001232227. The reversal of 12001232221 is 12223210021.

It is a happy number.

12001232221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12001232221 - 2¹¹ = 12001230173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12001232195 and 12001232204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001232227) 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 23 ways as a sum of consecutive naturals, for example, 7746955 + ... + 7748503.

It is an arithmetic number, because the mean of its divisors is an integer number (560836500).

Almost surely, 2^12001232221 is an apocalyptic number.

12001232221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12001232221 is a deficient number, since it is larger than the sum of its proper divisors (1458843779).

12001232221 is a wasteful number, since it uses less digits than its factorization.

12001232221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2061 (or 2020 counting only the distinct ones).

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

Adding to 12001232221 its reverse (12223210021), we get a palindrome (24224442242).

The spelling of 12001232221 in words is "twelve billion, one million, two hundred thirty-two thousand, two hundred twenty-one".