21112110220110 has 128 divisors (see below), whose sum is σ = 62400696744960. Its totient is φ = 4451653886976.

The previous prime is 21112110220099. The next prime is 21112110220127. The reversal of 21112110220110 is 1102201121112.

It is a happy number.

It is a super-2 number, since 2×21112110220110² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21112110220110.

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, 1989409 + ... + 6795731.

It is an arithmetic number, because the mean of its divisors is an integer number (487505443320).

Almost surely, 2^{21112110220110} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21112110220110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31200348372480).

21112110220110 is an abundant number, since it is smaller than the sum of its proper divisors (41288586524850).

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

21112110220110 is a wasteful number, since it uses less digits than its factorization.

21112110220110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4807962.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21112110220110 its reverse (1102201121112), we get a palindrome (22214311341222).

The spelling of 21112110220110 in words is "twenty-one trillion, one hundred twelve billion, one hundred ten million, two hundred twenty thousand, one hundred ten".