21543024200 has 24 divisors (see below), whose sum is σ = 50087531730. Its totient is φ = 8617209600.

The previous prime is 21543024179. The next prime is 21543024203. The reversal of 21543024200 is 242034512.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 16436778436 + 5106245764 = 128206^2 + 71458^2 .

It is not an unprimeable number, because it can be changed into a prime (21543024203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53857361 + ... + 53857760.

Almost surely, 2^21543024200 is an apocalyptic number.

21543024200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21543024200 is an abundant number, since it is smaller than the sum of its proper divisors (28544507530).

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

21543024200 is a wasteful number, since it uses less digits than its factorization.

21543024200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107715137 (or 107715128 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

Adding to 21543024200 its reverse (242034512), we get a palindrome (21785058712).

The spelling of 21543024200 in words is "twenty-one billion, five hundred forty-three million, twenty-four thousand, two hundred".