21120111110 has 64 divisors (see below), whose sum is σ = 44068147200. Its totient is φ = 7138061952.

The previous prime is 21120111071. The next prime is 21120111121. The reversal of 21120111110 is 1111102112.

It is a junction number, because it is equal to n+sod(n) for n = 21120111091 and 21120111100.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 2779196 + ... + 2786784.

It is an arithmetic number, because the mean of its divisors is an integer number (688564800).

Almost surely, 2^21120111110 is an apocalyptic number.

21120111110 is an abundant number, since it is smaller than the sum of its proper divisors (22948036090).

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

21120111110 is a wasteful number, since it uses less digits than its factorization.

21120111110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8165.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21120111110 its reverse (1111102112), we get a palindrome (22231213222).

The spelling of 21120111110 in words is "twenty-one billion, one hundred twenty million, one hundred eleven thousand, one hundred ten".