2221204217 has 2 divisors, whose sum is σ = 2221204218. Its totient is φ = 2221204216.

The previous prime is 2221204213. The next prime is 2221204247. The reversal of 2221204217 is 7124021222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1864598761 + 356605456 = 43181^2 + 18884^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221204217 - 2² = 2221204213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2221204192 and 2221204201.

It is not a weakly prime, because it can be changed into another prime (2221204213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110602108 + 1110602109.

It is an arithmetic number, because the mean of its divisors is an integer number (1110602109).

Almost surely, 2^2221204217 is an apocalyptic number.

It is an amenable number.

2221204217 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221204217 is an equidigital number, since it uses as much as digits as its factorization.

2221204217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 2221204217 is about 47129.6532662824. The cubic root of 2221204217 is about 1304.7565821684.

Adding to 2221204217 its reverse (7124021222), we get a palindrome (9345225439).

The spelling of 2221204217 in words is "two billion, two hundred twenty-one million, two hundred four thousand, two hundred seventeen".