1212221220193 has 2 divisors, whose sum is σ = 1212221220194. Its totient is φ = 1212221220192.

The previous prime is 1212221220151. The next prime is 1212221220241. The reversal of 1212221220193 is 3910221222121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1087083572689 + 125137647504 = 1042633^2 + 353748^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212221220193 - 2⁹ = 1212221219681 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212221226193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606110610096 + 606110610097.

It is an arithmetic number, because the mean of its divisors is an integer number (606110610097).

Almost surely, 2^{1212221220193} is an apocalyptic number.

It is an amenable number.

1212221220193 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212221220193 is an equidigital number, since it uses as much as digits as its factorization.

1212221220193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 1212221220193 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, two hundred twenty thousand, one hundred ninety-three".