21222021120020 has 96 divisors (see below), whose sum is σ = 52448286191616. Its totient is φ = 7061489049600.

The previous prime is 21222021120011. The next prime is 21222021120071. The reversal of 21222021120020 is 2002112022212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8582237 + ... + 10774916.

It is an arithmetic number, because the mean of its divisors is an integer number (546336314496).

Almost surely, 2^{21222021120020} is an apocalyptic number.

21222021120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222021120020 is an abundant number, since it is smaller than the sum of its proper divisors (31226265071596).

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

21222021120020 is a wasteful number, since it uses less digits than its factorization.

21222021120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19357401 (or 19357399 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21222021120020 its reverse (2002112022212), we get a palindrome (23224133142232).

The spelling of 21222021120020 in words is "twenty-one trillion, two hundred twenty-two billion, twenty-one million, one hundred twenty thousand, twenty".