21110120011121 has 4 divisors (see below), whose sum is σ = 21625000987044. Its totient is φ = 20595239035200.

The previous prime is 21110120011111. The next prime is 21110120011181. The reversal of 21110120011121 is 12111002101112.

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 2308044600625 + 18802075410496 = 1519225^2 + 4336136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21110120011121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21110120011096 and 21110120011105.

It is not an unprimeable number, because it can be changed into a prime (21110120011111) 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, 257440487900 + ... + 257440487981.

It is an arithmetic number, because the mean of its divisors is an integer number (5406250246761).

Almost surely, 2^{21110120011121} is an apocalyptic number.

It is an amenable number.

21110120011121 is a deficient number, since it is larger than the sum of its proper divisors (514880975923).

21110120011121 is an equidigital number, since it uses as much as digits as its factorization.

21110120011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514880975922.

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

Adding to 21110120011121 its reverse (12111002101112), we get a palindrome (33221122112233).

The spelling of 21110120011121 in words is "twenty-one trillion, one hundred ten billion, one hundred twenty million, eleven thousand, one hundred twenty-one".