21344042003 has 2 divisors, whose sum is σ = 21344042004. Its totient is φ = 21344042002.

The previous prime is 21344041993. The next prime is 21344042017. The reversal of 21344042003 is 30024044312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21344042003 - 2⁴ = 21344041987 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21344042003.

It is not a weakly prime, because it can be changed into another prime (21344042023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672021001 + 10672021002.

It is an arithmetic number, because the mean of its divisors is an integer number (10672021002).

Almost surely, 2^21344042003 is an apocalyptic number.

21344042003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21344042003 is an equidigital number, since it uses as much as digits as its factorization.

21344042003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21344042003 its reverse (30024044312), we get a palindrome (51368086315).

The spelling of 21344042003 in words is "twenty-one billion, three hundred forty-four million, forty-two thousand, three".