20112100121101 has 4 divisors (see below), whose sum is σ = 20387608342012. Its totient is φ = 19836591900192.

The previous prime is 20112100121089. The next prime is 20112100121129. The reversal of 20112100121101 is 10112100121102.

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 4331351816100 + 15780748305001 = 2081190^2 + 3972499^2 .

It is a cyclic number.

It is not a de Polignac number, because 20112100121101 - 2¹⁷ = 20112099990029 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 (20112100121131) 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, 137754110346 + ... + 137754110491.

It is an arithmetic number, because the mean of its divisors is an integer number (5096902085503).

Almost surely, 2^{20112100121101} is an apocalyptic number.

It is an amenable number.

20112100121101 is a deficient number, since it is larger than the sum of its proper divisors (275508220911).

20112100121101 is an equidigital number, since it uses as much as digits as its factorization.

20112100121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275508220910.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20112100121101 its reverse (10112100121102), we get a palindrome (30224200242203).

Subtracting from 20112100121101 its reverse (10112100121102), we obtain a palindrome (9999999999999).

The spelling of 20112100121101 in words is "twenty trillion, one hundred twelve billion, one hundred million, one hundred twenty-one thousand, one hundred one".