21002323243 has 8 divisors (see below), whose sum is σ = 24259368240. Its totient is φ = 17969902080.

The previous prime is 21002323213. The next prime is 21002323249. The reversal of 21002323243 is 34232320012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21002323243 - 2⁵ = 21002323211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002323249) 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 7 ways as a sum of consecutive naturals, for example, 56155758 + ... + 56156131.

It is an arithmetic number, because the mean of its divisors is an integer number (3032421030).

Almost surely, 2^21002323243 is an apocalyptic number.

21002323243 is a deficient number, since it is larger than the sum of its proper divisors (3257044997).

21002323243 is a wasteful number, since it uses less digits than its factorization.

21002323243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112311917.

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21002323243 its reverse (34232320012), we get a palindrome (55234643255).

The spelling of 21002323243 in words is "twenty-one billion, two million, three hundred twenty-three thousand, two hundred forty-three".