20111042121101 has 4 divisors (see below), whose sum is σ = 20111908962204. Its totient is φ = 20110175280000.

The previous prime is 20111042121091. The next prime is 20111042121139. The reversal of 20111042121101 is 10112124011102.

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 16541700988201 + 3569341132900 = 4067149^2 + 1889270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111042121101 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20111042121101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111042121601) 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, 433385750 + ... + 433432151.

It is an arithmetic number, because the mean of its divisors is an integer number (5027977240551).

Almost surely, 2^{20111042121101} is an apocalyptic number.

It is an amenable number.

20111042121101 is a deficient number, since it is larger than the sum of its proper divisors (866841103).

20111042121101 is an equidigital number, since it uses as much as digits as its factorization.

20111042121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866841102.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20111042121101 its reverse (10112124011102), we get a palindrome (30223166132203).

The spelling of 20111042121101 in words is "twenty trillion, one hundred eleven billion, forty-two million, one hundred twenty-one thousand, one hundred one".