21533441200 has 30 divisors (see below), whose sum is σ = 51734093444. Its totient is φ = 8613376320.

The previous prime is 21533441191. The next prime is 21533441207. The reversal of 21533441200 is 214433512.

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

It is not an unprimeable number, because it can be changed into a prime (21533441207) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 26916402 + ... + 26917201.

Almost surely, 2^21533441200 is an apocalyptic number.

21533441200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21533441200 is an abundant number, since it is smaller than the sum of its proper divisors (30200652244).

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

21533441200 is a wasteful number, since it uses less digits than its factorization.

21533441200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53833621 (or 53833610 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21533441200 its reverse (214433512), we get a palindrome (21747874712).

The spelling of 21533441200 in words is "twenty-one billion, five hundred thirty-three million, four hundred forty-one thousand, two hundred".