21323102020 has 48 divisors (see below), whose sum is σ = 50533761600. Its totient is φ = 7486478720.

The previous prime is 21323102011. The next prime is 21323102033. The reversal of 21323102020 is 2020132312.

It is a junction number, because it is equal to n+sod(n) for n = 21323101985 and 21323102003.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1664710 + ... + 1677469.

It is an arithmetic number, because the mean of its divisors is an integer number (1052786700).

Almost surely, 2^21323102020 is an apocalyptic number.

21323102020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21323102020 is an abundant number, since it is smaller than the sum of its proper divisors (29210659580).

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

21323102020 is a wasteful number, since it uses less digits than its factorization.

21323102020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3342228 (or 3342226 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21323102020 its reverse (2020132312), we get a palindrome (23343234332).

The spelling of 21323102020 in words is "twenty-one billion, three hundred twenty-three million, one hundred two thousand, twenty".