21000023033220 has 960 divisors, whose sum is σ = 83612986490880. Its totient is φ = 4285695744000.

The previous prime is 21000023033203. The next prime is 21000023033239. The reversal of 21000023033220 is 2233032000012.

It is a happy number.

21000023033220 is a `hidden beast` number, since 2 + 100 + 0 + 0 + 230 + 332 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21000023033193 and 21000023033202.

It is an unprimeable number.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 1676374597 + ... + 1676387123.

It is an arithmetic number, because the mean of its divisors is an integer number (87096860928).

Almost surely, 2^{21000023033220} is an apocalyptic number.

21000023033220 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 21000023033220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41806493245440).

21000023033220 is an abundant number, since it is smaller than the sum of its proper divisors (62612963457660).

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

21000023033220 is a wasteful number, since it uses less digits than its factorization.

21000023033220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12806 (or 12795 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 21000023033220 its reverse (2233032000012), we get a palindrome (23233055033232).

The spelling of 21000023033220 in words is "twenty-one trillion, twenty-three million, thirty-three thousand, two hundred twenty".