121220222173 has 2 divisors, whose sum is σ = 121220222174. Its totient is φ = 121220222172.

The previous prime is 121220222153. The next prime is 121220222213. The reversal of 121220222173 is 371222022121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112383846169 + 8836376004 = 335237^2 + 94002^2 .

It is an emirp because it is prime and its reverse (371222022121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121220222173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121220222113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610111086 + 60610111087.

It is an arithmetic number, because the mean of its divisors is an integer number (60610111087).

Almost surely, 2^121220222173 is an apocalyptic number.

It is an amenable number.

121220222173 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220222173 is an equidigital number, since it uses as much as digits as its factorization.

121220222173 is an evil number, because the sum of its binary digits is even.

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

Adding to 121220222173 its reverse (371222022121), we get a palindrome (492442244294).

The spelling of 121220222173 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred twenty-two thousand, one hundred seventy-three".