21110111110121 has 16 divisors (see below), whose sum is σ = 23071614160320. Its totient is φ = 19155685086720.

The previous prime is 21110111110117. The next prime is 21110111110163. The reversal of 21110111110121 is 12101111101112.

It is a cyclic number.

It is not a de Polignac number, because 21110111110121 - 2² = 21110111110117 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21110111110096 and 21110111110105.

It is not an unprimeable number, because it can be changed into a prime (21110111110111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42498290 + ... + 42992148.

It is an arithmetic number, because the mean of its divisors is an integer number (1441975885020).

Almost surely, 2^{21110111110121} is an apocalyptic number.

It is an amenable number.

21110111110121 is a deficient number, since it is larger than the sum of its proper divisors (1961503050199).

21110111110121 is a wasteful number, since it uses less digits than its factorization.

21110111110121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501016.

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 21110111110121 its reverse (12101111101112), we get a palindrome (33211222211233).

Subtracting from 21110111110121 its reverse (12101111101112), we obtain a palindrome (9009000009009).

The spelling of 21110111110121 in words is "twenty-one trillion, one hundred ten billion, one hundred eleven million, one hundred ten thousand, one hundred twenty-one".