21323030020 has 24 divisors (see below), whose sum is σ = 44843194368. Its totient is φ = 8516863200.

The previous prime is 21323029999. The next prime is 21323030021. The reversal of 21323030020 is 2003032312.

It is a junction number, because it is equal to n+sod(n) for n = 21323029976 and 21323030003.

It is not an unprimeable number, because it can be changed into a prime (21323030021) 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 7 ways as a sum of consecutive naturals, for example, 757636 + ... + 785275.

It is an arithmetic number, because the mean of its divisors is an integer number (1868466432).

Almost surely, 2^21323030020 is an apocalyptic number.

21323030020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21323030020 is an abundant number, since it is smaller than the sum of its proper divisors (23520164348).

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

21323030020 is a wasteful number, since it uses less digits than its factorization.

21323030020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1543611 (or 1543609 counting only the distinct ones).

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

Adding to 21323030020 its reverse (2003032312), we get a palindrome (23326062332).

The spelling of 21323030020 in words is "twenty-one billion, three hundred twenty-three million, thirty thousand, twenty".