20011112101 has 4 divisors (see below), whose sum is σ = 20098497100. Its totient is φ = 19923727104.

The previous prime is 20011112089. The next prime is 20011112137. The reversal of 20011112101 is 10121111002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15593515876 + 4417596225 = 124874^2 + 66465^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011112101 - 2²⁵ = 19977557669 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 (20011110101) 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, 43692156 + ... + 43692613.

It is an arithmetic number, because the mean of its divisors is an integer number (5024624275).

Almost surely, 2^20011112101 is an apocalyptic number.

It is an amenable number.

20011112101 is a deficient number, since it is larger than the sum of its proper divisors (87384999).

20011112101 is an equidigital number, since it uses as much as digits as its factorization.

20011112101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87384998.

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

Adding to 20011112101 its reverse (10121111002), we get a palindrome (30132223103).

It can be divided in two parts, 200111 and 12101, that added together give a palindrome (212212).

The spelling of 20011112101 in words is "twenty billion, eleven million, one hundred twelve thousand, one hundred one".