20111120011 has 4 divisors (see below), whose sum is σ = 20115685800. Its totient is φ = 20106554224.

The previous prime is 20111119993. The next prime is 20111120027. The reversal of 20111120011 is 11002111102.

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 20111120011 - 2⁹ = 20111119499 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20111120011.

It is not an unprimeable number, because it can be changed into a prime (20111120111) 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, 2276281 + ... + 2285098.

It is an arithmetic number, because the mean of its divisors is an integer number (5028921450).

Almost surely, 2^20111120011 is an apocalyptic number.

20111120011 is a deficient number, since it is larger than the sum of its proper divisors (4565789).

20111120011 is an equidigital number, since it uses as much as digits as its factorization.

20111120011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4565788.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 20111120011 its reverse (11002111102), we get a palindrome (31113231113).

It can be divided in two parts, 201111 and 20011, that added together give a palindrome (221122).

The spelling of 20111120011 in words is "twenty billion, one hundred eleven million, one hundred twenty thousand, eleven".