21210110110220 has 24 divisors (see below), whose sum is σ = 44544274488000. Its totient is φ = 8483464376192.

The previous prime is 21210110110219. The next prime is 21210110110237. The reversal of 21210110110220 is 2201101101212.

It is a junction number, because it is equal to n+sod(n) for n = 21210110110195 and 21210110110204.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35929145 + ... + 36514704.

It is an arithmetic number, because the mean of its divisors is an integer number (1856011437000).

Almost surely, 2^{21210110110220} is an apocalyptic number.

21210110110220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210110110220 is an abundant number, since it is smaller than the sum of its proper divisors (23334164377780).

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

21210110110220 is a wasteful number, since it uses less digits than its factorization.

21210110110220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72458497 (or 72458495 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21210110110220 its reverse (2201101101212), we get a palindrome (23411211211432).

The spelling of 21210110110220 in words is "twenty-one trillion, two hundred ten billion, one hundred ten million, one hundred ten thousand, two hundred twenty".