21543233200 has 60 divisors (see below), whose sum is σ = 52339250520. Its totient is φ = 8520455680.

The previous prime is 21543233191. The next prime is 21543233249. The reversal of 21543233200 is 233234512.

It is a super-2 number, since 2×21543233200² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 266974 + ... + 338173.

It is an arithmetic number, because the mean of its divisors is an integer number (872320842).

Almost surely, 2^21543233200 is an apocalyptic number.

21543233200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21543233200 is an abundant number, since it is smaller than the sum of its proper divisors (30796017320).

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

21543233200 is a wasteful number, since it uses less digits than its factorization.

21543233200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605254 (or 605243 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 25.

Adding to 21543233200 its reverse (233234512), we get a palindrome (21776467712).

The spelling of 21543233200 in words is "twenty-one billion, five hundred forty-three million, two hundred thirty-three thousand, two hundred".