21330222020 has 12 divisors (see below), whose sum is σ = 44793466284. Its totient is φ = 8532088800.

The previous prime is 21330221999. The next prime is 21330222047. The reversal of 21330222020 is 2022203312.

It can be written as a sum of positive squares in 2 ways, for example, as 16693156804 + 4637065216 = 129202^2 + 68096^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21330222020.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 533255531 + ... + 533255570.

It is an arithmetic number, because the mean of its divisors is an integer number (3732788857).

Almost surely, 2^21330222020 is an apocalyptic number.

21330222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21330222020 is an abundant number, since it is smaller than the sum of its proper divisors (23463244264).

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

21330222020 is a wasteful number, since it uses less digits than its factorization.

21330222020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066511110 (or 1066511108 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 21330222020 its reverse (2022203312), we get a palindrome (23352425332).

The spelling of 21330222020 in words is "twenty-one billion, three hundred thirty million, two hundred twenty-two thousand, twenty".