20111112101 has 4 divisors (see below), whose sum is σ = 20112379872. Its totient is φ = 20109844332.

The previous prime is 20111112097. The next prime is 20111112121. The reversal of 20111112101 is 10121111102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20111112101 - 2² = 20111112097 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 (20111112121) 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, 609785 + ... + 641918.

It is an arithmetic number, because the mean of its divisors is an integer number (5028094968).

Almost surely, 2^20111112101 is an apocalyptic number.

It is an amenable number.

20111112101 is a deficient number, since it is larger than the sum of its proper divisors (1267771).

20111112101 is a wasteful number, since it uses less digits than its factorization.

20111112101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1267770.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 20111112101 its reverse (10121111102), we get a palindrome (30232223203).

Subtracting from 20111112101 its reverse (10121111102), we obtain a palindrome (9990000999).

The spelling of 20111112101 in words is "twenty billion, one hundred eleven million, one hundred twelve thousand, one hundred one".