12012220221 has 8 divisors (see below), whose sum is σ = 16406935104. Its totient is φ = 7812826080.

The previous prime is 12012220159. The next prime is 12012220243. The reversal of 12012220221 is 12202221021.

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

It is not a de Polignac number, because 12012220221 - 2⁷ = 12012220093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12012220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012220291) 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, 48830041 + ... + 48830286.

It is an arithmetic number, because the mean of its divisors is an integer number (2050866888).

Almost surely, 2^12012220221 is an apocalyptic number.

It is an amenable number.

12012220221 is a deficient number, since it is larger than the sum of its proper divisors (4394714883).

12012220221 is an equidigital number, since it uses as much as digits as its factorization.

12012220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97660371.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 12012220221 its reverse (12202221021), we get a palindrome (24214441242).

The spelling of 12012220221 in words is "twelve billion, twelve million, two hundred twenty thousand, two hundred twenty-one".