21313312003 has 4 divisors (see below), whose sum is σ = 21613499568. Its totient is φ = 21013124440.

The previous prime is 21313311989. The next prime is 21313312019. The reversal of 21313312003 is 30021331312.

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 21313312003 - 2³³ = 12723377411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21313312093) 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, 150093676 + ... + 150093817.

It is an arithmetic number, because the mean of its divisors is an integer number (5403374892).

Almost surely, 2^21313312003 is an apocalyptic number.

21313312003 is a deficient number, since it is larger than the sum of its proper divisors (300187565).

21313312003 is an equidigital number, since it uses as much as digits as its factorization.

21313312003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300187564.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21313312003 its reverse (30021331312), we get a palindrome (51334643315).

The spelling of 21313312003 in words is "twenty-one billion, three hundred thirteen million, three hundred twelve thousand, three".