20111131011 has 16 divisors (see below), whose sum is σ = 26949611520. Its totient is φ = 13340120640.

The previous prime is 20111130983. The next prime is 20111131037. The reversal of 20111131011 is 11013111102.

It is not a de Polignac number, because 20111131011 - 2¹¹ = 20111128963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20111171011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1018450 + ... + 1038008.

It is an arithmetic number, because the mean of its divisors is an integer number (1684350720).

Almost surely, 2^20111131011 is an apocalyptic number.

20111131011 is a deficient number, since it is larger than the sum of its proper divisors (6838480509).

20111131011 is a wasteful number, since it uses less digits than its factorization.

20111131011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21266.

The product of its (nonzero) digits is 6, while the sum is 12.

Adding to 20111131011 its reverse (11013111102), we get a palindrome (31124242113).

The spelling of 20111131011 in words is "twenty billion, one hundred eleven million, one hundred thirty-one thousand, eleven".