12120221221 has 2 divisors, whose sum is σ = 12120221222. Its totient is φ = 12120221220.

The previous prime is 12120221189. The next prime is 12120221279. The reversal of 12120221221 is 12212202121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6970580100 + 5149641121 = 83490^2 + 71761^2 .

It is a cyclic number.

It is not a de Polignac number, because 12120221221 - 2⁵ = 12120221189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12120221195 and 12120221204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12120261221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060110610 + 6060110611.

It is an arithmetic number, because the mean of its divisors is an integer number (6060110611).

Almost surely, 2^12120221221 is an apocalyptic number.

It is an amenable number.

12120221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12120221221 is an equidigital number, since it uses as much as digits as its factorization.

12120221221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12120221221 its reverse (12212202121), we get a palindrome (24332423342).

The spelling of 12120221221 in words is "twelve billion, one hundred twenty million, two hundred twenty-one thousand, two hundred twenty-one".