12221100217 has 2 divisors, whose sum is σ = 12221100218. Its totient is φ = 12221100216.

The previous prime is 12221100197. The next prime is 12221100263. The reversal of 12221100217 is 71200112221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8444874816 + 3776225401 = 91896^2 + 61451^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12221100217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12221100194 and 12221100203.

It is not a weakly prime, because it can be changed into another prime (12221100517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110550108 + 6110550109.

It is an arithmetic number, because the mean of its divisors is an integer number (6110550109).

Almost surely, 2^12221100217 is an apocalyptic number.

It is an amenable number.

12221100217 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221100217 is an equidigital number, since it uses as much as digits as its factorization.

12221100217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 12221100217 its reverse (71200112221), we get a palindrome (83421212438).

The spelling of 12221100217 in words is "twelve billion, two hundred twenty-one million, one hundred thousand, two hundred seventeen".