21133224243 has 48 divisors (see below), whose sum is σ = 32393088000. Its totient is φ = 13762115136.

The previous prime is 21133224191. The next prime is 21133224247. The reversal of 21133224243 is 34242233112.

21133224243 is a `hidden beast` number, since 211 + 3 + 3 + 22 + 424 + 3 = 666.

It is not a de Polignac number, because 21133224243 - 2⁹ = 21133223731 is a prime.

It is a super-2 number, since 2×21133224243² (a number of 21 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (21133224247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7045258 + ... + 7048256.

It is an arithmetic number, because the mean of its divisors is an integer number (674856000).

Almost surely, 2^21133224243 is an apocalyptic number.

21133224243 is a deficient number, since it is larger than the sum of its proper divisors (11259863757).

21133224243 is an equidigital number, since it uses as much as digits as its factorization.

21133224243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3678 (or 3666 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

Adding to 21133224243 its reverse (34242233112), we get a palindrome (55375457355).

The spelling of 21133224243 in words is "twenty-one billion, one hundred thirty-three million, two hundred twenty-four thousand, two hundred forty-three".