1211221111193 has 2 divisors, whose sum is σ = 1211221111194. Its totient is φ = 1211221111192.

The previous prime is 1211221111187. The next prime is 1211221111201. The reversal of 1211221111193 is 3911111221121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 876492908944 + 334728202249 = 936212^2 + 578557^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211221111193 - 2³⁰ = 1210147369369 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211221311193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605610555596 + 605610555597.

It is an arithmetic number, because the mean of its divisors is an integer number (605610555597).

Almost surely, 2^{1211221111193} is an apocalyptic number.

It is an amenable number.

1211221111193 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211221111193 is an equidigital number, since it uses as much as digits as its factorization.

1211221111193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 26.

The spelling of 1211221111193 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, one hundred eleven thousand, one hundred ninety-three".