21222110120020 has 48 divisors (see below), whose sum is σ = 46060924492800. Its totient is φ = 8204855650560.

The previous prime is 21222110120017. The next prime is 21222110120021. The reversal of 21222110120020 is 2002101122212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21222110119976 and 21222110120003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222110120021) by changing a digit.

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, 20653680 + ... + 21656839.

It is an arithmetic number, because the mean of its divisors is an integer number (959602593600).

Almost surely, 2^{21222110120020} is an apocalyptic number.

21222110120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222110120020 is an abundant number, since it is smaller than the sum of its proper divisors (24838814372780).

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

21222110120020 is a wasteful number, since it uses less digits than its factorization.

21222110120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42311368 (or 42311366 counting only the distinct ones).

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

Adding to 21222110120020 its reverse (2002101122212), we get a palindrome (23224211242232).

The spelling of 21222110120020 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred ten million, one hundred twenty thousand, twenty".