21110110211 has 8 divisors (see below), whose sum is σ = 21149993760. Its totient is φ = 21070251072.

The previous prime is 21110110201. The next prime is 21110110223. The reversal of 21110110211 is 11201101112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21110110211 - 2²⁶ = 21043001347 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110110192 and 21110110201.

It is not an unprimeable number, because it can be changed into a prime (21110110201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3104231 + ... + 3111023.

It is an arithmetic number, because the mean of its divisors is an integer number (2643749220).

Almost surely, 2^21110110211 is an apocalyptic number.

21110110211 is a deficient number, since it is larger than the sum of its proper divisors (39883549).

21110110211 is an equidigital number, since it uses as much as digits as its factorization.

21110110211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12205.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21110110211 its reverse (11201101112), we get a palindrome (32311211323).

Subtracting from 21110110211 its reverse (11201101112), we obtain a palindrome (9909009099).

The spelling of 21110110211 in words is "twenty-one billion, one hundred ten million, one hundred ten thousand, two hundred eleven".