20121113101 has 4 divisors (see below), whose sum is σ = 20122078492. Its totient is φ = 20120147712.

The previous prime is 20121113099. The next prime is 20121113191. The reversal of 20121113101 is 10131112102.

It is a happy number.

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 1868832900 + 18252280201 = 43230^2 + 135101^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121113101 - 2¹ = 20121113099 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 (20121113191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 450726 + ... + 493351.

It is an arithmetic number, because the mean of its divisors is an integer number (5030519623).

Almost surely, 2^20121113101 is an apocalyptic number.

It is an amenable number.

20121113101 is a deficient number, since it is larger than the sum of its proper divisors (965391).

20121113101 is an equidigital number, since it uses as much as digits as its factorization.

20121113101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965390.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 20121113101 its reverse (10131112102), we get a palindrome (30252225203).

Subtracting from 20121113101 its reverse (10131112102), we obtain a palindrome (9990000999).

The spelling of 20121113101 in words is "twenty billion, one hundred twenty-one million, one hundred thirteen thousand, one hundred one".