21333103220 has 288 divisors, whose sum is σ = 55533993984. Its totient is φ = 6815577600.

The previous prime is 21333103219. The next prime is 21333103223. The reversal of 21333103220 is 2230133312.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21333103192 and 21333103201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333103223) 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 95 ways as a sum of consecutive naturals, for example, 95664029 + ... + 95664251.

It is an arithmetic number, because the mean of its divisors is an integer number (192826368).

Almost surely, 2^21333103220 is an apocalyptic number.

21333103220 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 21333103220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27766996992).

21333103220 is an abundant number, since it is smaller than the sum of its proper divisors (34200890764).

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

21333103220 is a wasteful number, since it uses less digits than its factorization.

21333103220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21333103220 its reverse (2230133312), we get a palindrome (23563236532).

The spelling of 21333103220 in words is "twenty-one billion, three hundred thirty-three million, one hundred three thousand, two hundred twenty".