21243323200 has 336 divisors, whose sum is σ = 59332416768. Its totient is φ = 7418880000.

The previous prime is 21243323191. The next prime is 21243323219. The reversal of 21243323200 is 232334212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50458990 + ... + 50459410.

Almost surely, 2^21243323200 is an apocalyptic number.

21243323200 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 21243323200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29666208384).

21243323200 is an abundant number, since it is smaller than the sum of its proper divisors (38089093568).

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

21243323200 is a wasteful number, since it uses less digits than its factorization.

21243323200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562 (or 547 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21243323200 its reverse (232334212), we get a palindrome (21475657412).

It can be divided in two parts, 21243 and 323200, that added together give a palindrome (344443).

The spelling of 21243323200 in words is "twenty-one billion, two hundred forty-three million, three hundred twenty-three thousand, two hundred".