221112191 has 2 divisors, whose sum is σ = 221112192. Its totient is φ = 221112190.

The previous prime is 221112167. The next prime is 221112239. The reversal of 221112191 is 191211122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221112191 - 2²² = 216917887 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221112121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110556095 + 110556096.

It is an arithmetic number, because the mean of its divisors is an integer number (110556096).

Almost surely, 2^221112191 is an apocalyptic number.

221112191 is a deficient number, since it is larger than the sum of its proper divisors (1).

221112191 is an equidigital number, since it uses as much as digits as its factorization.

221112191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 20.

The square root of 221112191 is about 14869.8416602195. The cubic root of 221112191 is about 604.6966500553.

The spelling of 221112191 in words is "two hundred twenty-one million, one hundred twelve thousand, one hundred ninety-one".