21118110112 has 48 divisors (see below), whose sum is σ = 45412617600. Its totient is φ = 9587146240.

The previous prime is 21118110109. The next prime is 21118110113. The reversal of 21118110112 is 21101181112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21118110112.

It is not an unprimeable number, because it can be changed into a prime (21118110113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 247689 + ... + 321847.

It is an arithmetic number, because the mean of its divisors is an integer number (946096200).

Almost surely, 2^21118110112 is an apocalyptic number.

21118110112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21118110112 is an abundant number, since it is smaller than the sum of its proper divisors (24294507488).

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

21118110112 is a wasteful number, since it uses less digits than its factorization.

21118110112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74989 (or 74981 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 21118110112 its reverse (21101181112), we get a palindrome (42219291224).

The spelling of 21118110112 in words is "twenty-one billion, one hundred eighteen million, one hundred ten thousand, one hundred twelve".