201111111111 has 8 divisors (see below), whose sum is σ = 269319101680. Its totient is φ = 133488597312.

The previous prime is 201111111109. The next prime is 201111111133. The reversal of 201111111111 is 111111111102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 201111111111 - 2¹ = 201111111109 is a prime.

It is a Duffinian number.

201111111111 is a modest number, since divided by 1111111 gives 20111 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201111111101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146368390 + ... + 146369763.

It is an arithmetic number, because the mean of its divisors is an integer number (33664887710).

Almost surely, 2^201111111111 is an apocalyptic number.

201111111111 is a deficient number, since it is larger than the sum of its proper divisors (68207990569).

201111111111 is a wasteful number, since it uses less digits than its factorization.

201111111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292738385.

The product of its (nonzero) digits is 2, while the sum is 12.

Adding to 201111111111 its reverse (111111111102), we get a palindrome (312222222213).

Subtracting from 201111111111 its reverse (111111111102), we obtain a palindrome (90000000009).

The spelling of 201111111111 in words is "two hundred one billion, one hundred eleven million, one hundred eleven thousand, one hundred eleven".