21020221200220 has 48 divisors (see below), whose sum is σ = 49708816367616. Its totient is φ = 7397145288000.

The previous prime is 21020221200161. The next prime is 21020221200269. The reversal of 21020221200220 is 2200212202012.

It is a super-3 number, since 3×21020221200220³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21020221200194 and 21020221200203.

It is a congruent number.

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, 1541065116 + ... + 1541078755.

It is an arithmetic number, because the mean of its divisors is an integer number (1035600340992).

Almost surely, 2^{21020221200220} is an apocalyptic number.

21020221200220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020221200220 is an abundant number, since it is smaller than the sum of its proper divisors (28688595167396).

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

21020221200220 is a wasteful number, since it uses less digits than its factorization.

21020221200220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3082143922 (or 3082143920 counting only the distinct ones).

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

Adding to 21020221200220 its reverse (2200212202012), we get a palindrome (23220433402232).

The spelling of 21020221200220 in words is "twenty-one trillion, twenty billion, two hundred twenty-one million, two hundred thousand, two hundred twenty".