12103210122221 has 2 divisors, whose sum is σ = 12103210122222. Its totient is φ = 12103210122220.

The previous prime is 12103210122209. The next prime is 12103210122239. The reversal of 12103210122221 is 12222101230121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8374159466596 + 3729050655625 = 2893814^2 + 1931075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12103210122221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12103210122193 and 12103210122202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12103210128221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6051605061110 + 6051605061111.

It is an arithmetic number, because the mean of its divisors is an integer number (6051605061111).

Almost surely, 2^{12103210122221} is an apocalyptic number.

It is an amenable number.

12103210122221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12103210122221 is an equidigital number, since it uses as much as digits as its factorization.

12103210122221 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 20.

Adding to 12103210122221 its reverse (12222101230121), we get a palindrome (24325311352342).

The spelling of 12103210122221 in words is "twelve trillion, one hundred three billion, two hundred ten million, one hundred twenty-two thousand, two hundred twenty-one".