221394846191 has 2 divisors, whose sum is σ = 221394846192. Its totient is φ = 221394846190.

The previous prime is 221394846133. The next prime is 221394846269. The reversal of 221394846191 is 191648493122.

221394846191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221394846191 - 2¹⁰ = 221394845167 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221394842191) 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, 110697423095 + 110697423096.

It is an arithmetic number, because the mean of its divisors is an integer number (110697423096).

Almost surely, 2^221394846191 is an apocalyptic number.

221394846191 is a deficient number, since it is larger than the sum of its proper divisors (1).

221394846191 is an equidigital number, since it uses as much as digits as its factorization.

221394846191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 50.

The spelling of 221394846191 in words is "two hundred twenty-one billion, three hundred ninety-four million, eight hundred forty-six thousand, one hundred ninety-one".