21115343203200 has 288 divisors, whose sum is σ = 79309879404600. Its totient is φ = 5334402355200.

The previous prime is 21115343203193. The next prime is 21115343203223. The reversal of 21115343203200 is 230234351112.

21115343203200 is a `hidden beast` number, since 2 + 1 + 1 + 15 + 3 + 4 + 320 + 320 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 18746791 + ... + 19841190.

Almost surely, 2^{21115343203200} is an apocalyptic number.

21115343203200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21115343203200 is an abundant number, since it is smaller than the sum of its proper divisors (58194536201400).

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

21115343203200 is a wasteful number, since it uses less digits than its factorization.

21115343203200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38588030 (or 38588010 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 21115343203200 its reverse (230234351112), we get a palindrome (21345577554312).

The spelling of 21115343203200 in words is "twenty-one trillion, one hundred fifteen billion, three hundred forty-three million, two hundred three thousand, two hundred".