20110121102111 has 4 divisors (see below), whose sum is σ = 20110161427032. Its totient is φ = 20110080777192.

The previous prime is 20110121102083. The next prime is 20110121102179. The reversal of 20110121102111 is 11120112101102.

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

It is a cyclic number.

It is not a de Polignac number, because 20110121102111 - 2¹⁸ = 20110120839967 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 (20110121102411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19404920 + ... + 20414973.

It is an arithmetic number, because the mean of its divisors is an integer number (5027540356758).

Almost surely, 2^{20110121102111} is an apocalyptic number.

20110121102111 is a deficient number, since it is larger than the sum of its proper divisors (40324921).

20110121102111 is an equidigital number, since it uses as much as digits as its factorization.

20110121102111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40324920.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 20110121102111 its reverse (11120112101102), we get a palindrome (31230233203213).

The spelling of 20110121102111 in words is "twenty trillion, one hundred ten billion, one hundred twenty-one million, one hundred two thousand, one hundred eleven".