21020033123320 has 256 divisors, whose sum is σ = 59486192640000. Its totient is φ = 6493974059520.

The previous prime is 21020033123303. The next prime is 21020033123351. The reversal of 21020033123320 is 2332133002012.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21020033123291 and 21020033123300.

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, 264966621 + ... + 265045939.

It is an arithmetic number, because the mean of its divisors is an integer number (232367940000).

Almost surely, 2^{21020033123320} is an apocalyptic number.

21020033123320 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 21020033123320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29743096320000).

21020033123320 is an abundant number, since it is smaller than the sum of its proper divisors (38466159516680).

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

21020033123320 is a wasteful number, since it uses less digits than its factorization.

21020033123320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80106 (or 80102 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21020033123320 its reverse (2332133002012), we get a palindrome (23352166125332).

The spelling of 21020033123320 in words is "twenty-one trillion, twenty billion, thirty-three million, one hundred twenty-three thousand, three hundred twenty".