21224000243 has 16 divisors (see below), whose sum is σ = 22055632896. Its totient is φ = 20410185600.

The previous prime is 21224000219. The next prime is 21224000261. The reversal of 21224000243 is 34200042212.

It is a cyclic number.

It is not a de Polignac number, because 21224000243 - 2²⁸ = 20955564787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21224000543) 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 15 ways as a sum of consecutive naturals, for example, 719246 + ... + 748172.

It is an arithmetic number, because the mean of its divisors is an integer number (1378477056).

Almost surely, 2^21224000243 is an apocalyptic number.

21224000243 is a deficient number, since it is larger than the sum of its proper divisors (831632653).

21224000243 is a wasteful number, since it uses less digits than its factorization.

21224000243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29234.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21224000243 its reverse (34200042212), we get a palindrome (55424042455).

The spelling of 21224000243 in words is "twenty-one billion, two hundred twenty-four million, two hundred forty-three", and thus it is an aban number.