21011122110211 has 8 divisors (see below), whose sum is σ = 21045043499040. Its totient is φ = 20977220351808.

The previous prime is 21011122110161. The next prime is 21011122110263. The reversal of 21011122110211 is 11201122111012.

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 21011122110211 - 2¹⁷ = 21011121979139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011122110271) 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 7 ways as a sum of consecutive naturals, for example, 2764456 + ... + 7047301.

It is an arithmetic number, because the mean of its divisors is an integer number (2630630437380).

Almost surely, 2^{21011122110211} is an apocalyptic number.

21011122110211 is a deficient number, since it is larger than the sum of its proper divisors (33921388829).

21011122110211 is an equidigital number, since it uses as much as digits as its factorization.

21011122110211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9815213.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 21011122110211 its reverse (11201122111012), we get a palindrome (32212244221223).

The spelling of 21011122110211 in words is "twenty-one trillion, eleven billion, one hundred twenty-two million, one hundred ten thousand, two hundred eleven".