21321430200 has 192 divisors, whose sum is σ = 83932128000. Its totient is φ = 4873461120.

The previous prime is 21321430189. The next prime is 21321430213. The reversal of 21321430200 is 203412312.

21321430200 is a `hidden beast` number, since 2 + 1 + 32 + 1 + 430 + 200 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 244230 + ... + 319829.

It is an arithmetic number, because the mean of its divisors is an integer number (437146500).

Almost surely, 2^21321430200 is an apocalyptic number.

21321430200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21321430200 is an abundant number, since it is smaller than the sum of its proper divisors (62610697800).

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

21321430200 is a wasteful number, since it uses less digits than its factorization.

21321430200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564091 (or 564076 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21321430200 its reverse (203412312), we get a palindrome (21524842512).

The spelling of 21321430200 in words is "twenty-one billion, three hundred twenty-one million, four hundred thirty thousand, two hundred".