21200021110 has 16 divisors (see below), whose sum is σ = 38161778832. Its totient is φ = 8479621600.

The previous prime is 21200021107. The next prime is 21200021111. The reversal of 21200021110 is 1112000212.

21200021110 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 (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200021111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304245 + ... + 367375.

It is an arithmetic number, because the mean of its divisors is an integer number (2385111177).

Almost surely, 2^21200021110 is an apocalyptic number.

21200021110 is a deficient number, since it is larger than the sum of its proper divisors (16961757722).

21200021110 is a wasteful number, since it uses less digits than its factorization.

21200021110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96719.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21200021110 its reverse (1112000212), we get a palindrome (22312021322).

The spelling of 21200021110 in words is "twenty-one billion, two hundred million, twenty-one thousand, one hundred ten".