221201012191 has 2 divisors, whose sum is σ = 221201012192. Its totient is φ = 221201012190.

The previous prime is 221201012171. The next prime is 221201012209. The reversal of 221201012191 is 191210102122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221201012191 - 2¹¹ = 221201010143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221201012141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110600506095 + 110600506096.

It is an arithmetic number, because the mean of its divisors is an integer number (110600506096).

Almost surely, 2^221201012191 is an apocalyptic number.

221201012191 is a deficient number, since it is larger than the sum of its proper divisors (1).

221201012191 is an equidigital number, since it uses as much as digits as its factorization.

221201012191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 221201012191 in words is "two hundred twenty-one billion, two hundred one million, twelve thousand, one hundred ninety-one".