21110000212111 has 4 divisors (see below), whose sum is σ = 21110072305672. Its totient is φ = 21109928118552.

The previous prime is 21110000212061. The next prime is 21110000212187. The reversal of 21110000212111 is 11121200001112.

It is a happy number.

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 21110000212111 - 2²⁵ = 21109966657679 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110000212091 and 21110000212100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110000210111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35605761 + ... + 36193786.

It is an arithmetic number, because the mean of its divisors is an integer number (5277518076418).

Almost surely, 2^{21110000212111} is an apocalyptic number.

21110000212111 is a deficient number, since it is larger than the sum of its proper divisors (72093561).

21110000212111 is an equidigital number, since it uses as much as digits as its factorization.

21110000212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72093560.

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

Adding to 21110000212111 its reverse (11121200001112), we get a palindrome (32231200213223).

The spelling of 21110000212111 in words is "twenty-one trillion, one hundred ten billion, two hundred twelve thousand, one hundred eleven".