22331221217 has 2 divisors, whose sum is σ = 22331221218. Its totient is φ = 22331221216.

The previous prime is 22331221153. The next prime is 22331221271. The reversal of 22331221217 is 71212213322.

Together with next prime (22331221271) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13023602641 + 9307618576 = 114121^2 + 96476^2 .

It is a cyclic number.

It is not a de Polignac number, because 22331221217 - 2⁶ = 22331221153 is a prime.

It is a super-2 number, since 2×22331221217² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22331223217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11165610608 + 11165610609.

It is an arithmetic number, because the mean of its divisors is an integer number (11165610609).

Almost surely, 2^22331221217 is an apocalyptic number.

It is an amenable number.

22331221217 is a deficient number, since it is larger than the sum of its proper divisors (1).

22331221217 is an equidigital number, since it uses as much as digits as its factorization.

22331221217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 26.

Adding to 22331221217 its reverse (71212213322), we get a palindrome (93543434539).

The spelling of 22331221217 in words is "twenty-two billion, three hundred thirty-one million, two hundred twenty-one thousand, two hundred seventeen".