20011011111011 has 4 divisors (see below), whose sum is σ = 20030270988000. Its totient is φ = 19991751234024.

The previous prime is 20011011111001. The next prime is 20011011111023. The reversal of 20011011111011 is 11011111011002.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011011111011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011011110983 and 20011011111001.

It is not an unprimeable number, because it can be changed into a prime (20011011111001) 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, 9629936936 + ... + 9629939013.

It is an arithmetic number, because the mean of its divisors is an integer number (5007567747000).

Almost surely, 2^{20011011111011} is an apocalyptic number.

20011011111011 is a deficient number, since it is larger than the sum of its proper divisors (19259876989).

20011011111011 is a wasteful number, since it uses less digits than its factorization.

20011011111011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19259876988.

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

Adding to 20011011111011 its reverse (11011111011002), we get a palindrome (31022122122013).

The spelling of 20011011111011 in words is "twenty trillion, eleven billion, eleven million, one hundred eleven thousand, eleven".