21222001202020 has 48 divisors (see below), whose sum is σ = 44600879167488. Its totient is φ = 8482196327040.

The previous prime is 21222001201903. The next prime is 21222001202069. The reversal of 21222001202020 is 2020210022212.

It is a junction number, because it is equal to n+sod(n) for n = 21222001201985 and 21222001202003.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 613494925 + ... + 613529515.

It is an arithmetic number, because the mean of its divisors is an integer number (929184982656).

Almost surely, 2^{21222001202020} is an apocalyptic number.

21222001202020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222001202020 is an abundant number, since it is smaller than the sum of its proper divisors (23378877965468).

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

21222001202020 is a wasteful number, since it uses less digits than its factorization.

21222001202020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57580 (or 57578 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21222001202020 its reverse (2020210022212), we get a palindrome (23242211224232).

The spelling of 21222001202020 in words is "twenty-one trillion, two hundred twenty-two billion, one million, two hundred two thousand, twenty".