12020221121 has 2 divisors, whose sum is σ = 12020221122. Its totient is φ = 12020221120.

The previous prime is 12020221111. The next prime is 12020221159. The reversal of 12020221121 is 12112202021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10007801521 + 2012419600 = 100039^2 + 44860^2 .

It is a cyclic number.

It is not a de Polignac number, because 12020221121 - 2¹⁴ = 12020204737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12020221096 and 12020221105.

It is not a weakly prime, because it can be changed into another prime (12020221111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010110560 + 6010110561.

It is an arithmetic number, because the mean of its divisors is an integer number (6010110561).

Almost surely, 2^12020221121 is an apocalyptic number.

It is an amenable number.

12020221121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12020221121 is an equidigital number, since it uses as much as digits as its factorization.

12020221121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12020221121 its reverse (12112202021), we get a palindrome (24132423142).

The spelling of 12020221121 in words is "twelve billion, twenty million, two hundred twenty-one thousand, one hundred twenty-one".