21111112110112 has 24 divisors (see below), whose sum is σ = 42529071782736. Its totient is φ = 10310078006592.

The previous prime is 21111112110073. The next prime is 21111112110113. The reversal of 21111112110112 is 21101121111112.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (21111112110113) 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, 7671187618 + ... + 7671190369.

It is an arithmetic number, because the mean of its divisors is an integer number (1772044657614).

Almost surely, 2^{21111112110112} is an apocalyptic number.

It is an amenable number.

21111112110112 is an abundant number, since it is smaller than the sum of its proper divisors (21417959672624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111112110112 is a wasteful number, since it uses less digits than its factorization.

21111112110112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15342378040 (or 15342378032 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 21111112110112 its reverse (21101121111112), we get a palindrome (42212233221224).

The spelling of 21111112110112 in words is "twenty-one trillion, one hundred eleven billion, one hundred twelve million, one hundred ten thousand, one hundred twelve".