21344013203 has 4 divisors (see below), whose sum is σ = 21344491728. Its totient is φ = 21343534680.

The previous prime is 21344013193. The next prime is 21344013289. The reversal of 21344013203 is 30231044312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21344013203 - 2⁶ = 21344013139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21344013293) 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 3 ways as a sum of consecutive naturals, for example, 164588 + ... + 264153.

It is an arithmetic number, because the mean of its divisors is an integer number (5336122932).

Almost surely, 2^21344013203 is an apocalyptic number.

21344013203 is a deficient number, since it is larger than the sum of its proper divisors (478525).

21344013203 is an equidigital number, since it uses as much as digits as its factorization.

21344013203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478524.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21344013203 its reverse (30231044312), we get a palindrome (51575057515).

The spelling of 21344013203 in words is "twenty-one billion, three hundred forty-four million, thirteen thousand, two hundred three".