20012111011 has 16 divisors (see below), whose sum is σ = 20465583264. Its totient is φ = 19563945984.

The previous prime is 20012110991. The next prime is 20012111023. The reversal of 20012111011 is 11011121002.

It is a cyclic number.

It is not a de Polignac number, because 20012111011 - 2⁷ = 20012110883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20012111711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9469891 + ... + 9472003.

It is an arithmetic number, because the mean of its divisors is an integer number (1279098954).

Almost surely, 2^20012111011 is an apocalyptic number.

20012111011 is a deficient number, since it is larger than the sum of its proper divisors (453472253).

20012111011 is a wasteful number, since it uses less digits than its factorization.

20012111011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3270.

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

Adding to 20012111011 its reverse (11011121002), we get a palindrome (31023232013).

Subtracting from 20012111011 its reverse (11011121002), we obtain a palindrome (9000990009).

The spelling of 20012111011 in words is "twenty billion, twelve million, one hundred eleven thousand, eleven".