21222000222020 has 24 divisors (see below), whose sum is σ = 47994369733464. Its totient is φ = 7835815466496.

The previous prime is 21222000222019. The next prime is 21222000222023. The reversal of 21222000222020 is 2022200022212.

It can be written as a sum of positive squares in 4 ways, for example, as 782414549764 + 20439585672256 = 884542^2 + 4521016^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21222000222020.

It is not an unprimeable number, because it can be changed into a prime (21222000222023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40811538629 + ... + 40811539148.

It is an arithmetic number, because the mean of its divisors is an integer number (1999765405561).

Almost surely, 2^{21222000222020} is an apocalyptic number.

21222000222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222000222020 is an abundant number, since it is smaller than the sum of its proper divisors (26772369511444).

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

21222000222020 is a wasteful number, since it uses less digits than its factorization.

21222000222020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81623077799 (or 81623077797 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 21222000222020 its reverse (2022200022212), we get a palindrome (23244200244232).

The spelling of 21222000222020 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-two thousand, twenty".