221222340221 has 2 divisors, whose sum is σ = 221222340222. Its totient is φ = 221222340220.

The previous prime is 221222340187. The next prime is 221222340247. The reversal of 221222340221 is 122043222122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215077975225 + 6144364996 = 463765^2 + 78386^2 .

It is a cyclic number.

It is not a de Polignac number, because 221222340221 - 2¹⁴ = 221222323837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221222340281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110611170110 + 110611170111.

It is an arithmetic number, because the mean of its divisors is an integer number (110611170111).

Almost surely, 2^221222340221 is an apocalyptic number.

It is an amenable number.

221222340221 is a deficient number, since it is larger than the sum of its proper divisors (1).

221222340221 is an equidigital number, since it uses as much as digits as its factorization.

221222340221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 221222340221 its reverse (122043222122), we get a palindrome (343265562343).

The spelling of 221222340221 in words is "two hundred twenty-one billion, two hundred twenty-two million, three hundred forty thousand, two hundred twenty-one".