221657222241209 has 2 divisors, whose sum is σ = 221657222241210. Its totient is φ = 221657222241208.

The previous prime is 221657222241199. The next prime is 221657222241289. The reversal of 221657222241209 is 902142222756122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209194712509225 + 12462509731984 = 14463565^2 + 3530228^2 .

It is a cyclic number.

It is not a de Polignac number, because 221657222241209 - 2⁴ = 221657222241193 is a prime.

It is not a weakly prime, because it can be changed into another prime (221657222241289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110828611120604 + 110828611120605.

It is an arithmetic number, because the mean of its divisors is an integer number (110828611120605).

Almost surely, 2^{221657222241209} is an apocalyptic number.

It is an amenable number.

221657222241209 is a deficient number, since it is larger than the sum of its proper divisors (1).

221657222241209 is an equidigital number, since it uses as much as digits as its factorization.

221657222241209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 967680, while the sum is 47.

The spelling of 221657222241209 in words is "two hundred twenty-one trillion, six hundred fifty-seven billion, two hundred twenty-two million, two hundred forty-one thousand, two hundred nine".