21101321110211 has 4 divisors (see below), whose sum is σ = 21368426440800. Its totient is φ = 20834215779624.

The previous prime is 21101321110127. The next prime is 21101321110253. The reversal of 21101321110211 is 11201112310112.

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 21101321110211 - 2³⁴ = 21084141241027 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21101321110211.

It is not an unprimeable number, because it can be changed into a prime (21101321110411) 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, 133552665176 + ... + 133552665333.

It is an arithmetic number, because the mean of its divisors is an integer number (5342106610200).

Almost surely, 2^{21101321110211} is an apocalyptic number.

21101321110211 is a deficient number, since it is larger than the sum of its proper divisors (267105330589).

21101321110211 is an equidigital number, since it uses as much as digits as its factorization.

21101321110211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267105330588.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 21101321110211 its reverse (11201112310112), we get a palindrome (32302433420323).

The spelling of 21101321110211 in words is "twenty-one trillion, one hundred one billion, three hundred twenty-one million, one hundred ten thousand, two hundred eleven".