21133024220 has 192 divisors, whose sum is σ = 58688243712. Its totient is φ = 6196608000.

The previous prime is 21133024219. The next prime is 21133024223. The reversal of 21133024220 is 2242033112.

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 = 21133024192 and 21133024201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133024223) 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 63 ways as a sum of consecutive naturals, for example, 2155730 + ... + 2165510.

It is an arithmetic number, because the mean of its divisors is an integer number (305667936).

Almost surely, 2^21133024220 is an apocalyptic number.

21133024220 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 21133024220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29344121856).

21133024220 is an abundant number, since it is smaller than the sum of its proper divisors (37555219492).

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

21133024220 is a wasteful number, since it uses less digits than its factorization.

21133024220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9892 (or 9890 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21133024220 its reverse (2242033112), we get a palindrome (23375057332).

The spelling of 21133024220 in words is "twenty-one billion, one hundred thirty-three million, twenty-four thousand, two hundred twenty".