21003011303 has 4 divisors (see below), whose sum is σ = 21020327448. Its totient is φ = 20985695160.

The previous prime is 21003011291. The next prime is 21003011317. The reversal of 21003011303 is 30311030012.

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 21003011303 - 2⁴ = 21003011287 is a prime.

It is a super-2 number, since 2×21003011303² (a number of 21 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 (21003011353) 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 3 ways as a sum of consecutive naturals, for example, 8656253 + ... + 8658678.

It is an arithmetic number, because the mean of its divisors is an integer number (5255081862).

Almost surely, 2^21003011303 is an apocalyptic number.

21003011303 is a deficient number, since it is larger than the sum of its proper divisors (17316145).

21003011303 is a wasteful number, since it uses less digits than its factorization.

21003011303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17316144.

The product of its (nonzero) digits is 54, while the sum is 14.

Adding to 21003011303 its reverse (30311030012), we get a palindrome (51314041315).

The spelling of 21003011303 in words is "twenty-one billion, three million, eleven thousand, three hundred three".