12101210221 has 2 divisors, whose sum is σ = 12101210222. Its totient is φ = 12101210220.

The previous prime is 12101210171. The next prime is 12101210237. The reversal of 12101210221 is 12201210121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11965953321 + 135256900 = 109389^2 + 11630^2 .

It is a cyclic number.

It is not a de Polignac number, because 12101210221 - 2¹¹ = 12101208173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12101210021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6050605110 + 6050605111.

It is an arithmetic number, because the mean of its divisors is an integer number (6050605111).

Almost surely, 2^12101210221 is an apocalyptic number.

It is an amenable number.

12101210221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12101210221 is an equidigital number, since it uses as much as digits as its factorization.

12101210221 is an evil number, because the sum of its binary digits is even.

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

Adding to 12101210221 its reverse (12201210121), we get a palindrome (24302420342).

The spelling of 12101210221 in words is "twelve billion, one hundred one million, two hundred ten thousand, two hundred twenty-one".