12212322217 has 2 divisors, whose sum is σ = 12212322218. Its totient is φ = 12212322216.

The previous prime is 12212322193. The next prime is 12212322223. The reversal of 12212322217 is 71222321221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12127295376 + 85026841 = 110124^2 + 9221^2 .

It is an emirp because it is prime and its reverse (71222321221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12212322217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12212322191 and 12212322200.

It is not a weakly prime, because it can be changed into another prime (12212322247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6106161108 + 6106161109.

It is an arithmetic number, because the mean of its divisors is an integer number (6106161109).

Almost surely, 2^12212322217 is an apocalyptic number.

It is an amenable number.

12212322217 is a deficient number, since it is larger than the sum of its proper divisors (1).

12212322217 is an equidigital number, since it uses as much as digits as its factorization.

12212322217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 25.

Adding to 12212322217 its reverse (71222321221), we get a palindrome (83434643438).

The spelling of 12212322217 in words is "twelve billion, two hundred twelve million, three hundred twenty-two thousand, two hundred seventeen".