121210212200221 has 2 divisors, whose sum is σ = 121210212200222. Its totient is φ = 121210212200220.

The previous prime is 121210212200201. The next prime is 121210212200237. The reversal of 121210212200221 is 122002212012121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121160961494596 + 49250705625 = 11007314^2 + 221925^2 .

It is a cyclic number.

It is not a de Polignac number, because 121210212200221 - 2⁹ = 121210212199709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121210212200201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605106100110 + 60605106100111.

It is an arithmetic number, because the mean of its divisors is an integer number (60605106100111).

Almost surely, 2^{121210212200221} is an apocalyptic number.

It is an amenable number.

121210212200221 is a deficient number, since it is larger than the sum of its proper divisors (1).

121210212200221 is an equidigital number, since it uses as much as digits as its factorization.

121210212200221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 121210212200221 its reverse (122002212012121), we get a palindrome (243212424212342).

The spelling of 121210212200221 in words is "one hundred twenty-one trillion, two hundred ten billion, two hundred twelve million, two hundred thousand, two hundred twenty-one".