201111122011 has 4 divisors (see below), whose sum is σ = 201114865224. Its totient is φ = 201107378800.

The previous prime is 201111121969. The next prime is 201111122039. The reversal of 201111122011 is 110221111102.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 201111122011 - 2⁹ = 201111121499 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201111121982 and 201111122000.

It is not an unprimeable number, because it can be changed into a prime (201111122071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1789825 + ... + 1898866.

It is an arithmetic number, because the mean of its divisors is an integer number (50278716306).

Almost surely, 2^201111122011 is an apocalyptic number.

201111122011 is a deficient number, since it is larger than the sum of its proper divisors (3743213).

201111122011 is an equidigital number, since it uses as much as digits as its factorization.

201111122011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3743212.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 201111122011 its reverse (110221111102), we get a palindrome (311332233113).

The spelling of 201111122011 in words is "two hundred one billion, one hundred eleven million, one hundred twenty-two thousand, eleven".