21211010112111 has 32 divisors (see below), whose sum is σ = 31523665743360. Its totient is φ = 12607338295296.

The previous prime is 21211010112109. The next prime is 21211010112121. The reversal of 21211010112111 is 11121101011212.

It is not a de Polignac number, because 21211010112111 - 2¹ = 21211010112109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211010112101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10639615 + ... + 12474911.

It is an arithmetic number, because the mean of its divisors is an integer number (985114554480).

Almost surely, 2^{21211010112111} is an apocalyptic number.

21211010112111 is a deficient number, since it is larger than the sum of its proper divisors (10312655631249).

21211010112111 is a wasteful number, since it uses less digits than its factorization.

21211010112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1847263.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21211010112111 its reverse (11121101011212), we get a palindrome (32332111123323).

It can be divided in two parts, 2121101011211 and 1, that added together give a palindrome (2121101011212).

The spelling of 21211010112111 in words is "twenty-one trillion, two hundred eleven billion, ten million, one hundred twelve thousand, one hundred eleven".