21323321020 has 24 divisors (see below), whose sum is σ = 44781937200. Its totient is φ = 8528764032.

The previous prime is 21323320981. The next prime is 21323321021. The reversal of 21323321020 is 2012332312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323321021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 414271 + ... + 462889.

It is an arithmetic number, because the mean of its divisors is an integer number (1865914050).

Almost surely, 2^21323321020 is an apocalyptic number.

21323321020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21323321020 is an abundant number, since it is smaller than the sum of its proper divisors (23458616180).

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

21323321020 is a wasteful number, since it uses less digits than its factorization.

21323321020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70557 (or 70555 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21323321020 its reverse (2012332312), we get a palindrome (23335653332).

The spelling of 21323321020 in words is "twenty-one billion, three hundred twenty-three million, three hundred twenty-one thousand, twenty".