21111100102110 has 128 divisors (see below), whose sum is σ = 54814831948800. Its totient is φ = 5189179386240.

The previous prime is 21111100102067. The next prime is 21111100102177. The reversal of 21111100102110 is 1120100111112.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 28506615 + ... + 29237805.

It is an arithmetic number, because the mean of its divisors is an integer number (428240874600).

Almost surely, 2^{21111100102110} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21111100102110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27407415974400).

21111100102110 is an abundant number, since it is smaller than the sum of its proper divisors (33703731846690).

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

21111100102110 is an equidigital number, since it uses as much as digits as its factorization.

21111100102110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731331 (or 731257 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21111100102110 its reverse (1120100111112), we get a palindrome (22231200213222).

The spelling of 21111100102110 in words is "twenty-one trillion, one hundred eleven billion, one hundred million, one hundred two thousand, one hundred ten".