20111011011011 has 4 divisors (see below), whose sum is σ = 20121425829624. Its totient is φ = 20100596192400.

The previous prime is 20111011010983. The next prime is 20111011011037. The reversal of 20111011011011 is 11011011011102.

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 20111011011011 - 2²² = 20111006816707 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111011010983 and 20111011011001.

It is not an unprimeable number, because it can be changed into a prime (20111011011071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5207406410 + ... + 5207410271.

It is an arithmetic number, because the mean of its divisors is an integer number (5030356457406).

Almost surely, 2^{20111011011011} is an apocalyptic number.

20111011011011 is a deficient number, since it is larger than the sum of its proper divisors (10414818613).

20111011011011 is a wasteful number, since it uses less digits than its factorization.

20111011011011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10414818612.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 20111011011011 its reverse (11011011011102), we get a palindrome (31122022022113).

Subtracting from 20111011011011 its reverse (11011011011102), we obtain a palindrome (9099999999909).

The spelling of 20111011011011 in words is "twenty trillion, one hundred eleven billion, eleven million, eleven thousand, eleven".