12103124221 has 2 divisors, whose sum is σ = 12103124222. Its totient is φ = 12103124220.

The previous prime is 12103124197. The next prime is 12103124237. The reversal of 12103124221 is 12242130121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7746464196 + 4356660025 = 88014^2 + 66005^2 .

It is a cyclic number.

It is not a de Polignac number, because 12103124221 - 2⁷ = 12103124093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12103124251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6051562110 + 6051562111.

It is an arithmetic number, because the mean of its divisors is an integer number (6051562111).

Almost surely, 2^12103124221 is an apocalyptic number.

It is an amenable number.

12103124221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12103124221 is an equidigital number, since it uses as much as digits as its factorization.

12103124221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 12103124221 its reverse (12242130121), we get a palindrome (24345254342).

The spelling of 12103124221 in words is "twelve billion, one hundred three million, one hundred twenty-four thousand, two hundred twenty-one".