21222110202220 has 96 divisors (see below), whose sum is σ = 47745348956928. Its totient is φ = 7895376986112.

The previous prime is 21222110202211. The next prime is 21222110202233. The reversal of 21222110202220 is 2220201122212.

It is a super-2 number, since 2×21222110202220² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21717469 + ... + 22673611.

It is an arithmetic number, because the mean of its divisors is an integer number (497347384968).

Almost surely, 2^{21222110202220} is an apocalyptic number.

21222110202220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21222110202220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23872674478464).

21222110202220 is an abundant number, since it is smaller than the sum of its proper divisors (26523238754708).

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

21222110202220 is a wasteful number, since it uses less digits than its factorization.

21222110202220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956939 (or 956937 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21222110202220 its reverse (2220201122212), we get a palindrome (23442311324432).

The spelling of 21222110202220 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred ten million, two hundred two thousand, two hundred twenty".