12001223221 has 8 divisors (see below), whose sum is σ = 13023055584. Its totient is φ = 10993485360.

The previous prime is 12001223203. The next prime is 12001223237. The reversal of 12001223221 is 12232210021.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12001223221 - 2⁷ = 12001223093 is a prime.

It is a super-2 number, since 2×12001223221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12001223195 and 12001223204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001223921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3521851 + ... + 3525256.

It is an arithmetic number, because the mean of its divisors is an integer number (1627881948).

Almost surely, 2^12001223221 is an apocalyptic number.

It is an amenable number.

12001223221 is a deficient number, since it is larger than the sum of its proper divisors (1021832363).

12001223221 is a wasteful number, since it uses less digits than its factorization.

12001223221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7047251.

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

Adding to 12001223221 its reverse (12232210021), we get a palindrome (24233433242).

The spelling of 12001223221 in words is "twelve billion, one million, two hundred twenty-three thousand, two hundred twenty-one".