201111001121 has 4 divisors (see below), whose sum is σ = 201175442244. Its totient is φ = 201046560000.

The previous prime is 201111001099. The next prime is 201111001139. The reversal of 201111001121 is 121100111102.

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 5117971600 + 195993029521 = 71540^2 + 442711^2 .

It is a cyclic number.

It is not a de Polignac number, because 201111001121 - 2¹⁸ = 201110738977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201111001921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32215880 + ... + 32222121.

It is an arithmetic number, because the mean of its divisors is an integer number (50293860561).

Almost surely, 2^201111001121 is an apocalyptic number.

It is an amenable number.

201111001121 is a deficient number, since it is larger than the sum of its proper divisors (64441123).

201111001121 is an equidigital number, since it uses as much as digits as its factorization.

201111001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64441122.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 201111001121 its reverse (121100111102), we get a palindrome (322211112223).

The spelling of 201111001121 in words is "two hundred one billion, one hundred eleven million, one thousand, one hundred twenty-one".