21113312003 has 8 divisors (see below), whose sum is σ = 24192503808. Its totient is φ = 18049871304.

The previous prime is 21113311991. The next prime is 21113312021. The reversal of 21113312003 is 30021331112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21113312003 - 2²² = 21109117699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21113312053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3934901 + ... + 3940262.

It is an arithmetic number, because the mean of its divisors is an integer number (3024062976).

Almost surely, 2^21113312003 is an apocalyptic number.

21113312003 is a deficient number, since it is larger than the sum of its proper divisors (3079191805).

21113312003 is an equidigital number, since it uses as much as digits as its factorization.

21113312003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7875553.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21113312003 its reverse (30021331112), we get a palindrome (51134643115).

The spelling of 21113312003 in words is "twenty-one billion, one hundred thirteen million, three hundred twelve thousand, three".