191220112201 has 4 divisors (see below), whose sum is σ = 191226607812. Its totient is φ = 191213616592.

The previous prime is 191220112199. The next prime is 191220112231. The reversal of 191220112201 is 102211022191.

191220112201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32675985225 + 158544126976 = 180765^2 + 398176^2 .

It is a cyclic number.

It is not a de Polignac number, because 191220112201 - 2¹ = 191220112199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191220112231) 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 in 3 ways as a sum of consecutive naturals, for example, 3203446 + ... + 3262591.

It is an arithmetic number, because the mean of its divisors is an integer number (47806651953).

Almost surely, 2^191220112201 is an apocalyptic number.

It is an amenable number.

191220112201 is a deficient number, since it is larger than the sum of its proper divisors (6495611).

191220112201 is an equidigital number, since it uses as much as digits as its factorization.

191220112201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6495610.

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

Adding to 191220112201 its reverse (102211022191), we get a palindrome (293431134392).

The spelling of 191220112201 in words is "one hundred ninety-one billion, two hundred twenty million, one hundred twelve thousand, two hundred one".