1220211011191 has 2 divisors, whose sum is σ = 1220211011192. Its totient is φ = 1220211011190.

The previous prime is 1220211011183. The next prime is 1220211011221. The reversal of 1220211011191 is 1911101120221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220211011191 - 2³ = 1220211011183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220211012191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610105505595 + 610105505596.

It is an arithmetic number, because the mean of its divisors is an integer number (610105505596).

Almost surely, 2^{1220211011191} is an apocalyptic number.

1220211011191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220211011191 is an equidigital number, since it uses as much as digits as its factorization.

1220211011191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 22.

The spelling of 1220211011191 in words is "one trillion, two hundred twenty billion, two hundred eleven million, eleven thousand, one hundred ninety-one".