21110122110 has 128 divisors (see below), whose sum is σ = 63791981568. Its totient is φ = 4343040000.

The previous prime is 21110122109. The next prime is 21110122133. The reversal of 21110122110 is 1122101112.

It is a super-2 number, since 2×21110122110² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 188070 + ... + 278550.

It is an arithmetic number, because the mean of its divisors is an integer number (498374856).

Almost surely, 2^21110122110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21110122110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31895990784).

21110122110 is an abundant number, since it is smaller than the sum of its proper divisors (42681859458).

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

21110122110 is a wasteful number, since it uses less digits than its factorization.

21110122110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90610.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21110122110 its reverse (1122101112), we get a palindrome (22232223222).

The spelling of 21110122110 in words is "twenty-one billion, one hundred ten million, one hundred twenty-two thousand, one hundred ten".