12221221193 has 2 divisors, whose sum is σ = 12221221194. Its totient is φ = 12221221192.

The previous prime is 12221221153. The next prime is 12221221213. The reversal of 12221221193 is 39112212221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7921534009 + 4299687184 = 89003^2 + 65572^2 .

It is an emirp because it is prime and its reverse (39112212221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12221221193 - 2³² = 7926253897 is a prime.

It is not a weakly prime, because it can be changed into another prime (12221221153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110610596 + 6110610597.

It is an arithmetic number, because the mean of its divisors is an integer number (6110610597).

Almost surely, 2^12221221193 is an apocalyptic number.

It is an amenable number.

12221221193 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221221193 is an equidigital number, since it uses as much as digits as its factorization.

12221221193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The spelling of 12221221193 in words is "twelve billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred ninety-three".