221222112017 has 2 divisors, whose sum is σ = 221222112018. Its totient is φ = 221222112016.

The previous prime is 221222112011. The next prime is 221222112047. The reversal of 221222112017 is 710211222122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124354264321 + 96867847696 = 352639^2 + 311236^2 .

It is a cyclic number.

It is not a de Polignac number, because 221222112017 - 2¹⁸ = 221221849873 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221222111983 and 221222112001.

It is not a weakly prime, because it can be changed into another prime (221222112011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110611056008 + 110611056009.

It is an arithmetic number, because the mean of its divisors is an integer number (110611056009).

Almost surely, 2^221222112017 is an apocalyptic number.

It is an amenable number.

221222112017 is a deficient number, since it is larger than the sum of its proper divisors (1).

221222112017 is an equidigital number, since it uses as much as digits as its factorization.

221222112017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 23.

Adding to 221222112017 its reverse (710211222122), we get a palindrome (931433334139).

The spelling of 221222112017 in words is "two hundred twenty-one billion, two hundred twenty-two million, one hundred twelve thousand, seventeen".