22021042217 has 2 divisors, whose sum is σ = 22021042218. Its totient is φ = 22021042216.

The previous prime is 22021042213. The next prime is 22021042289. The reversal of 22021042217 is 71224012022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21839223961 + 181818256 = 147781^2 + 13484^2 .

It is a cyclic number.

It is not a de Polignac number, because 22021042217 - 2² = 22021042213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22021042192 and 22021042201.

It is not a weakly prime, because it can be changed into another prime (22021042213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11010521108 + 11010521109.

It is an arithmetic number, because the mean of its divisors is an integer number (11010521109).

Almost surely, 2^22021042217 is an apocalyptic number.

It is an amenable number.

22021042217 is a deficient number, since it is larger than the sum of its proper divisors (1).

22021042217 is an equidigital number, since it uses as much as digits as its factorization.

22021042217 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.

Adding to 22021042217 its reverse (71224012022), we get a palindrome (93245054239).

The spelling of 22021042217 in words is "twenty-two billion, twenty-one million, forty-two thousand, two hundred seventeen".