21001112118 has 48 divisors (see below), whose sum is σ = 52220413440. Its totient is φ = 5975203248.

The previous prime is 21001112117. The next prime is 21001112141. The reversal of 21001112118 is 81121110012.

21001112118 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 21001112118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001112117) 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 23 ways as a sum of consecutive naturals, for example, 318580 + ... + 378807.

It is an arithmetic number, because the mean of its divisors is an integer number (1087925280).

Almost surely, 2^21001112118 is an apocalyptic number.

21001112118 is an abundant number, since it is smaller than the sum of its proper divisors (31219301322).

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

21001112118 is a wasteful number, since it uses less digits than its factorization.

21001112118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697641 (or 697638 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

The spelling of 21001112118 in words is "twenty-one billion, one million, one hundred twelve thousand, one hundred eighteen".