20121112101 has 4 divisors (see below), whose sum is σ = 26828149472. Its totient is φ = 13414074732.

The previous prime is 20121112097. The next prime is 20121112111. The reversal of 20121112101 is 10121112102.

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 not a de Polignac number, because 20121112101 - 2² = 20121112097 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 (20121112111) 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, 3353518681 + ... + 3353518686.

It is an arithmetic number, because the mean of its divisors is an integer number (6707037368).

Almost surely, 2^20121112101 is an apocalyptic number.

It is an amenable number.

20121112101 is a deficient number, since it is larger than the sum of its proper divisors (6707037371).

20121112101 is an equidigital number, since it uses as much as digits as its factorization.

20121112101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6707037370.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20121112101 its reverse (10121112102), we get a palindrome (30242224203).

Subtracting from 20121112101 its reverse (10121112102), we obtain a palindrome (9999999999).

It can be divided in two parts, 201211 and 12101, that added together give a palindrome (213312).

The spelling of 20121112101 in words is "twenty billion, one hundred twenty-one million, one hundred twelve thousand, one hundred one".