221223201217 has 2 divisors, whose sum is σ = 221223201218. Its totient is φ = 221223201216.

The previous prime is 221223201193. The next prime is 221223201229. The reversal of 221223201217 is 712102322122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221096503681 + 126697536 = 470209^2 + 11256^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221223201217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221223201191 and 221223201200.

It is not a weakly prime, because it can be changed into another prime (221223211217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110611600608 + 110611600609.

It is an arithmetic number, because the mean of its divisors is an integer number (110611600609).

Almost surely, 2^221223201217 is an apocalyptic number.

It is an amenable number.

221223201217 is a deficient number, since it is larger than the sum of its proper divisors (1).

221223201217 is an equidigital number, since it uses as much as digits as its factorization.

221223201217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 25.

Adding to 221223201217 its reverse (712102322122), we get a palindrome (933325523339).

The spelling of 221223201217 in words is "two hundred twenty-one billion, two hundred twenty-three million, two hundred one thousand, two hundred seventeen".