21001112110 has 96 divisors (see below), whose sum is σ = 43969353120. Its totient is φ = 7196555520.

The previous prime is 21001112071. The next prime is 21001112117. The reversal of 21001112110 is 1121110012.

It is a Harshad number since it is a multiple of its sum of digits (10).

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 47 ways as a sum of consecutive naturals, for example, 4526712 + ... + 4531348.

It is an arithmetic number, because the mean of its divisors is an integer number (458014095).

Almost surely, 2^21001112110 is an apocalyptic number.

21001112110 is an abundant number, since it is smaller than the sum of its proper divisors (22968241010).

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

21001112110 is a wasteful number, since it uses less digits than its factorization.

21001112110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4882 (or 4871 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21001112110 its reverse (1121110012), we get a palindrome (22122222122).

The spelling of 21001112110 in words is "twenty-one billion, one million, one hundred twelve thousand, one hundred ten".