12121010221 has 2 divisors, whose sum is σ = 12121010222. Its totient is φ = 12121010220.

The previous prime is 12121010207. The next prime is 12121010249. The reversal of 12121010221 is 12201012121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12015228996 + 105781225 = 109614^2 + 10285^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121010221 - 2²⁹ = 11584139309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12121010921) 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, 6060505110 + 6060505111.

It is an arithmetic number, because the mean of its divisors is an integer number (6060505111).

Almost surely, 2^12121010221 is an apocalyptic number.

It is an amenable number.

12121010221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121010221 is an equidigital number, since it uses as much as digits as its factorization.

12121010221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12121010221 its reverse (12201012121), we get a palindrome (24322022342).

The spelling of 12121010221 in words is "twelve billion, one hundred twenty-one million, ten thousand, two hundred twenty-one".