21211102110 has 256 divisors, whose sum is σ = 58506624000. Its totient is φ = 4876185600.

The previous prime is 21211102091. The next prime is 21211102127. The reversal of 21211102110 is 1120111212.

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 127 ways as a sum of consecutive naturals, for example, 142356316 + ... + 142356464.

It is an arithmetic number, because the mean of its divisors is an integer number (228541500).

Almost surely, 2^21211102110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21211102110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29253312000).

21211102110 is an abundant number, since it is smaller than the sum of its proper divisors (37295521890).

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

21211102110 is a wasteful number, since it uses less digits than its factorization.

21211102110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427.

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

Adding to 21211102110 its reverse (1120111212), we get a palindrome (22331213322).

It can be divided in two parts, 21211102 and 110, that added together give a palindrome (21211212).

The spelling of 21211102110 in words is "twenty-one billion, two hundred eleven million, one hundred two thousand, one hundred ten".