201011121191 has 4 divisors (see below), whose sum is σ = 205685798472. Its totient is φ = 196336443912.

The previous prime is 201011121173. The next prime is 201011121247. The reversal of 201011121191 is 191121110102.

201011121191 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201011121191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201011121131) 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, 2337338576 + ... + 2337338661.

It is an arithmetic number, because the mean of its divisors is an integer number (51421449618).

Almost surely, 2^201011121191 is an apocalyptic number.

201011121191 is a deficient number, since it is larger than the sum of its proper divisors (4674677281).

201011121191 is an equidigital number, since it uses as much as digits as its factorization.

201011121191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4674677280.

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

Adding to 201011121191 its reverse (191121110102), we get a palindrome (392132231293).

It can be divided in two parts, 2010111 and 21191, that added together give a palindrome (2031302).

The spelling of 201011121191 in words is "two hundred one billion, eleven million, one hundred twenty-one thousand, one hundred ninety-one".