21222001020220 has 192 divisors, whose sum is σ = 60679919204352. Its totient is φ = 6019832448000.

The previous prime is 21222001020203. The next prime is 21222001020229. The reversal of 21222001020220 is 2202010022212.

It is a junction number, because it is equal to n+sod(n) for n = 21222001020194 and 21222001020203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222001020229) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6043651 + ... + 8886490.

It is an arithmetic number, because the mean of its divisors is an integer number (316041245856).

Almost surely, 2^{21222001020220} is an apocalyptic number.

21222001020220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222001020220 is an abundant number, since it is smaller than the sum of its proper divisors (39457918184132).

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

21222001020220 is a wasteful number, since it uses less digits than its factorization.

21222001020220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14930252 (or 14930250 counting only the distinct ones).

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

Adding to 21222001020220 its reverse (2202010022212), we get a palindrome (23424011042432).

The spelling of 21222001020220 in words is "twenty-one trillion, two hundred twenty-two billion, one million, twenty thousand, two hundred twenty".