21533353200 has 120 divisors (see below), whose sum is σ = 76642825200. Its totient is φ = 5742224640.

The previous prime is 21533353187. The next prime is 21533353223. The reversal of 21533353200 is 235333512.

21533353200 is a `hidden beast` number, since 2 + 1 + 5 + 3 + 335 + 320 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 986115 + ... + 1007714.

It is an arithmetic number, because the mean of its divisors is an integer number (638690210).

Almost surely, 2^21533353200 is an apocalyptic number.

21533353200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21533353200 is an abundant number, since it is smaller than the sum of its proper divisors (55109472000).

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

21533353200 is a wasteful number, since it uses less digits than its factorization.

21533353200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1993856 (or 1993839 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 27.

Adding to 21533353200 its reverse (235333512), we get a palindrome (21768686712).

The spelling of 21533353200 in words is "twenty-one billion, five hundred thirty-three million, three hundred fifty-three thousand, two hundred".