21111000111112 has 32 divisors (see below), whose sum is σ = 40127331154680. Its totient is φ = 10410392678400.

The previous prime is 21111000111109. The next prime is 21111000111143. The reversal of 21111000111112 is 21111100011112.

It can be written as a sum of positive squares in 4 ways, for example, as 19821853326276 + 1289146784836 = 4452174^2 + 1135406^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21111000111092 and 21111000111101.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11148612 + ... + 12904012.

Almost surely, 2^{21111000111112} is an apocalyptic number.

It is an amenable number.

21111000111112 is a deficient number, since it is larger than the sum of its proper divisors (19016331043568).

21111000111112 is a wasteful number, since it uses less digits than its factorization.

21111000111112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776073 (or 1776069 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 21111000111112 its reverse (21111100011112), we get a palindrome (42222100122224).

The spelling of 21111000111112 in words is "twenty-one trillion, one hundred eleven billion, one hundred eleven thousand, one hundred twelve".