21020220000220 has 192 divisors, whose sum is σ = 52623886049280. Its totient is φ = 6902799740928.

The previous prime is 21020220000217. The next prime is 21020220000251. The reversal of 21020220000220 is 2200002202012.

It is a super-3 number, since 3×21020220000220³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21020220000220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 137830929 + ... + 137983351.

It is an arithmetic number, because the mean of its divisors is an integer number (274082739840).

Almost surely, 2^{21020220000220} is an apocalyptic number.

21020220000220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21020220000220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26311943024640).

21020220000220 is an abundant number, since it is smaller than the sum of its proper divisors (31603666049060).

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

21020220000220 is a wasteful number, since it uses less digits than its factorization.

21020220000220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152892 (or 152890 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 21020220000220 its reverse (2200002202012), we get a palindrome (23220222202232).

The spelling of 21020220000220 in words is "twenty-one trillion, twenty billion, two hundred twenty million, two hundred twenty", and thus it is an aban number.