221111100191 has 2 divisors, whose sum is σ = 221111100192. Its totient is φ = 221111100190.

The previous prime is 221111100181. The next prime is 221111100227. The reversal of 221111100191 is 191001111122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221111100191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221111100181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110555550095 + 110555550096.

It is an arithmetic number, because the mean of its divisors is an integer number (110555550096).

Almost surely, 2^221111100191 is an apocalyptic number.

221111100191 is a deficient number, since it is larger than the sum of its proper divisors (1).

221111100191 is an equidigital number, since it uses as much as digits as its factorization.

221111100191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 20.

The spelling of 221111100191 in words is "two hundred twenty-one billion, one hundred eleven million, one hundred thousand, one hundred ninety-one".