20012111101 has 16 divisors (see below), whose sum is σ = 21563965440. Its totient is φ = 18517538160.

The previous prime is 20012111099. The next prime is 20012111129. The reversal of 20012111101 is 10111121002.

It is a cyclic number.

It is not a de Polignac number, because 20012111101 - 2¹ = 20012111099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012111201) 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, 3647106 + ... + 3652588.

It is an arithmetic number, because the mean of its divisors is an integer number (1347747840).

Almost surely, 2^20012111101 is an apocalyptic number.

It is an amenable number.

20012111101 is a deficient number, since it is larger than the sum of its proper divisors (1551854339).

20012111101 is a wasteful number, since it uses less digits than its factorization.

20012111101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10656.

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

Adding to 20012111101 its reverse (10111121002), we get a palindrome (30123232103).

Subtracting from 20012111101 its reverse (10111121002), we obtain a palindrome (9900990099).

The spelling of 20012111101 in words is "twenty billion, twelve million, one hundred eleven thousand, one hundred one".