21200220200220 has 48 divisors (see below), whose sum is σ = 59494613512320. Its totient is φ = 5640630438976.

The previous prime is 21200220200191. The next prime is 21200220200221. The reversal of 21200220200220 is 2200202200212.

It is a super-3 number, since 3×21200220200220³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21200220200220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200220200221) 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, 398773650 + ... + 398826809.

It is an arithmetic number, because the mean of its divisors is an integer number (1239471114840).

Almost surely, 2^{21200220200220} is an apocalyptic number.

21200220200220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200220200220 is an abundant number, since it is smaller than the sum of its proper divisors (38294393312100).

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

21200220200220 is a wasteful number, since it uses less digits than its factorization.

21200220200220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797600914 (or 797600912 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

Adding to 21200220200220 its reverse (2200202200212), we get a palindrome (23400422400432).

The spelling of 21200220200220 in words is "twenty-one trillion, two hundred billion, two hundred twenty million, two hundred thousand, two hundred twenty".