21323205200 has 60 divisors (see below), whose sum is σ = 55886193888. Its totient is φ = 7753891200.

The previous prime is 21323205181. The next prime is 21323205283. The reversal of 21323205200 is 250232312.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2418692 + ... + 2427491.

Almost surely, 2^21323205200 is an apocalyptic number.

21323205200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21323205200 is an abundant number, since it is smaller than the sum of its proper divisors (34562988688).

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

21323205200 is a wasteful number, since it uses less digits than its factorization.

21323205200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4846212 (or 4846201 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

Adding to 21323205200 its reverse (250232312), we get a palindrome (21573437512).

The spelling of 21323205200 in words is "twenty-one billion, three hundred twenty-three million, two hundred five thousand, two hundred".