21023330020 has 96 divisors (see below), whose sum is σ = 55143970560. Its totient is φ = 6540695040.

The previous prime is 21023330011. The next prime is 21023330023. The reversal of 21023330020 is 2003332012.

It is a junction number, because it is equal to n+sod(n) for n = 21023329976 and 21023330003.

It is not an unprimeable number, because it can be changed into a prime (21023330023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 845526 + ... + 870034.

It is an arithmetic number, because the mean of its divisors is an integer number (574416360).

Almost surely, 2^21023330020 is an apocalyptic number.

21023330020 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 21023330020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27571985280).

21023330020 is an abundant number, since it is smaller than the sum of its proper divisors (34120640540).

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

21023330020 is a wasteful number, since it uses less digits than its factorization.

21023330020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25093 (or 25091 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 16.

Adding to 21023330020 its reverse (2003332012), we get a palindrome (23026662032).

The spelling of 21023330020 in words is "twenty-one billion, twenty-three million, three hundred thirty thousand, twenty".