12210420121 has 2 divisors, whose sum is σ = 12210420122. Its totient is φ = 12210420120.

The previous prime is 12210420029. The next prime is 12210420143. The reversal of 12210420121 is 12102401221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7333353225 + 4877066896 = 85635^2 + 69836^2 .

It is an emirp because it is prime and its reverse (12102401221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12210420121 - 2²⁷ = 12076202393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12210420095 and 12210420104.

It is not a weakly prime, because it can be changed into another prime (12210420161) 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 as a sum of consecutive naturals, namely, 6105210060 + 6105210061.

It is an arithmetic number, because the mean of its divisors is an integer number (6105210061).

Almost surely, 2^12210420121 is an apocalyptic number.

It is an amenable number.

12210420121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12210420121 is an equidigital number, since it uses as much as digits as its factorization.

12210420121 is an odious number, because the sum of its binary digits is odd.

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

Adding to 12210420121 its reverse (12102401221), we get a palindrome (24312821342).

The spelling of 12210420121 in words is "twelve billion, two hundred ten million, four hundred twenty thousand, one hundred twenty-one".