1221222193 has 2 divisors, whose sum is σ = 1221222194. Its totient is φ = 1221222192.

The previous prime is 1221222181. The next prime is 1221222203. The reversal of 1221222193 is 3912221221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 688905009 + 532317184 = 26247^2 + 23072^2 .

It is an emirp because it is prime and its reverse (3912221221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221222193 - 2²¹ = 1219125041 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221222113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610611096 + 610611097.

It is an arithmetic number, because the mean of its divisors is an integer number (610611097).

Almost surely, 2^1221222193 is an apocalyptic number.

It is an amenable number.

1221222193 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221222193 is an equidigital number, since it uses as much as digits as its factorization.

1221222193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 25.

The square root of 1221222193 is about 34945.9896554669. The cubic root of 1221222193 is about 1068.8864278811.

The spelling of 1221222193 in words is "one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred ninety-three".