21112121110011 has 16 divisors (see below), whose sum is σ = 28942474057728. Its totient is φ = 13680791265600.

The previous prime is 21112121109949. The next prime is 21112121110049. The reversal of 21112121110011 is 11001112121112.

It is not a de Polignac number, because 21112121110011 - 2³⁴ = 21094941240827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112121110111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 316651651 + ... + 316718316.

It is an arithmetic number, because the mean of its divisors is an integer number (1808904628608).

Almost surely, 2^{21112121110011} is an apocalyptic number.

21112121110011 is a deficient number, since it is larger than the sum of its proper divisors (7830352947717).

21112121110011 is a wasteful number, since it uses less digits than its factorization.

21112121110011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633370282.

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

Adding to 21112121110011 its reverse (11001112121112), we get a palindrome (32113233231123).

It can be divided in two parts, 2111212 and 1110011, that added together give a palindrome (3221223).

The spelling of 21112121110011 in words is "twenty-one trillion, one hundred twelve billion, one hundred twenty-one million, one hundred ten thousand, eleven".