12221220173 has 2 divisors, whose sum is σ = 12221220174. Its totient is φ = 12221220172.

The previous prime is 12221220163. The next prime is 12221220229. The reversal of 12221220173 is 37102212221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7451660329 + 4769559844 = 86323^2 + 69062^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221220173 - 2²⁶ = 12154111309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12221220113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110610086 + 6110610087.

It is an arithmetic number, because the mean of its divisors is an integer number (6110610087).

Almost surely, 2^12221220173 is an apocalyptic number.

It is an amenable number.

12221220173 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221220173 is an equidigital number, since it uses as much as digits as its factorization.

12221220173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

Adding to 12221220173 its reverse (37102212221), we get a palindrome (49323432394).

The spelling of 12221220173 in words is "twelve billion, two hundred twenty-one million, two hundred twenty thousand, one hundred seventy-three".