21003321010303 has 12 divisors (see below), whose sum is σ = 21506216062728. Its totient is φ = 20511927097200.

The previous prime is 21003321010297. The next prime is 21003321010327. The reversal of 21003321010303 is 30301012330012.

It is not a de Polignac number, because 21003321010303 - 2²⁹ = 21002784139391 is a prime.

It is a super-2 number, since 2×21003321010303² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003321014303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12125728 + ... + 13749178.

It is an arithmetic number, because the mean of its divisors is an integer number (1792184671894).

Almost surely, 2^{21003321010303} is an apocalyptic number.

21003321010303 is a deficient number, since it is larger than the sum of its proper divisors (502895052425).

21003321010303 is an equidigital number, since it uses as much as digits as its factorization.

21003321010303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630534 (or 1630491 counting only the distinct ones).

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

Adding to 21003321010303 its reverse (30301012330012), we get a palindrome (51304333340315).

The spelling of 21003321010303 in words is "twenty-one trillion, three billion, three hundred twenty-one million, ten thousand, three hundred three".