21343043003 has 4 divisors (see below), whose sum is σ = 21345496248. Its totient is φ = 21340589760.

The previous prime is 21343042949. The next prime is 21343043009. The reversal of 21343043003 is 30034034312.

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 21343043003 - 2¹⁴ = 21343026619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21343043003.

It is not an unprimeable number, because it can be changed into a prime (21343043009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1213526 + ... + 1230987.

It is an arithmetic number, because the mean of its divisors is an integer number (5336374062).

Almost surely, 2^21343043003 is an apocalyptic number.

21343043003 is a deficient number, since it is larger than the sum of its proper divisors (2453245).

21343043003 is an equidigital number, since it uses as much as digits as its factorization.

21343043003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2453244.

The product of its (nonzero) digits is 2592, while the sum is 23.

Adding to 21343043003 its reverse (30034034312), we get a palindrome (51377077315).

The spelling of 21343043003 in words is "twenty-one billion, three hundred forty-three million, forty-three thousand, three".