21222210110020 has 48 divisors (see below), whose sum is σ = 44825544534960. Its totient is φ = 8439571961856.

The previous prime is 21222210110011. The next prime is 21222210110083. The reversal of 21222210110020 is 2001101222212.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 182228241924 + 21039981868096 = 426882^2 + 4586936^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21222210109976 and 21222210110003.

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 15 ways as a sum of consecutive naturals, for example, 163776616 + ... + 163906144.

It is an arithmetic number, because the mean of its divisors is an integer number (933865511145).

Almost surely, 2^{21222210110020} is an apocalyptic number.

21222210110020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222210110020 is an abundant number, since it is smaller than the sum of its proper divisors (23603334424940).

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

21222210110020 is a wasteful number, since it uses less digits than its factorization.

21222210110020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177064 (or 177062 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21222210110020 its reverse (2001101222212), we get a palindrome (23223311332232).

The spelling of 21222210110020 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred ten million, one hundred ten thousand, twenty".