221221102220221 has 2 divisors, whose sum is σ = 221221102220222. Its totient is φ = 221221102220220.

The previous prime is 221221102220207. The next prime is 221221102220267. The reversal of 221221102220221 is 122022201122122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180472732152196 + 40748370068025 = 13434014^2 + 6383445^2 .

It is a cyclic number.

It is not a de Polignac number, because 221221102220221 - 2²³ = 221221093831613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221221102220192 and 221221102220201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221221102220291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610551110110 + 110610551110111.

It is an arithmetic number, because the mean of its divisors is an integer number (110610551110111).

Almost surely, 2^{221221102220221} is an apocalyptic number.

It is an amenable number.

221221102220221 is a deficient number, since it is larger than the sum of its proper divisors (1).

221221102220221 is an equidigital number, since it uses as much as digits as its factorization.

221221102220221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 221221102220221 its reverse (122022201122122), we get a palindrome (343243303342343).

The spelling of 221221102220221 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, one hundred two million, two hundred twenty thousand, two hundred twenty-one".