21310003003 has 4 divisors (see below), whose sum is σ = 21310294968. Its totient is φ = 21309711040.

The previous prime is 21310002991. The next prime is 21310003019. The reversal of 21310003003 is 30030001312.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21310003003 - 2⁹ = 21310002491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21310003903) 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, 71700 + ... + 218542.

It is an arithmetic number, because the mean of its divisors is an integer number (5327573742).

Almost surely, 2^21310003003 is an apocalyptic number.

21310003003 is a deficient number, since it is larger than the sum of its proper divisors (291965).

21310003003 is a wasteful number, since it uses less digits than its factorization.

21310003003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291964.

The product of its (nonzero) digits is 54, while the sum is 13.

Adding to 21310003003 its reverse (30030001312), we get a palindrome (51340004315).

The spelling of 21310003003 in words is "twenty-one billion, three hundred ten million, three thousand, three".