12020321221 has 8 divisors (see below), whose sum is σ = 12200592600. Its totient is φ = 11841054720.

The previous prime is 12020321219. The next prime is 12020321231. The reversal of 12020321221 is 12212302021.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 102232321 + 11918088900 = 10111^2 + 109170^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12020321221 - 2¹ = 12020321219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12020321195 and 12020321204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12020321231) 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 7 ways as a sum of consecutive naturals, for example, 227100 + ... + 274981.

It is an arithmetic number, because the mean of its divisors is an integer number (1525074075).

Almost surely, 2^12020321221 is an apocalyptic number.

It is an amenable number.

12020321221 is a deficient number, since it is larger than the sum of its proper divisors (180271379).

12020321221 is an equidigital number, since it uses as much as digits as its factorization.

12020321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502439.

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

Adding to 12020321221 its reverse (12212302021), we get a palindrome (24232623242).

The spelling of 12020321221 in words is "twelve billion, twenty million, three hundred twenty-one thousand, two hundred twenty-one".