12020331221 has 4 divisors (see below), whose sum is σ = 12022582944. Its totient is φ = 12018079500.

The previous prime is 12020331203. The next prime is 12020331223. The reversal of 12020331221 is 12213302021.

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.

It is a cyclic number.

It is not a de Polignac number, because 12020331221 - 2⁶ = 12020331157 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 12020331221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12020331223) 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, 1117835 + ... + 1128536.

It is an arithmetic number, because the mean of its divisors is an integer number (3005645736).

Almost surely, 2^12020331221 is an apocalyptic number.

It is an amenable number.

12020331221 is a deficient number, since it is larger than the sum of its proper divisors (2251723).

12020331221 is an equidigital number, since it uses as much as digits as its factorization.

12020331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2251722.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 12020331221 its reverse (12213302021), we get a palindrome (24233633242).

The spelling of 12020331221 in words is "twelve billion, twenty million, three hundred thirty-one thousand, two hundred twenty-one".