21003030303 has 4 divisors (see below), whose sum is σ = 28004040408. Its totient is φ = 14002020200.

The previous prime is 21003030289. The next prime is 21003030319. The reversal of 21003030303 is 30303030012.

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 21003030303 - 2¹⁶ = 21002964767 is a prime.

It is a super-2 number, since 2×21003030303² (a number of 21 digits) contains 22 as substring.

21003030303 is a modest number, since divided by 30303 gives 21003 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003031303) 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, 3500505048 + ... + 3500505053.

It is an arithmetic number, because the mean of its divisors is an integer number (7001010102).

Almost surely, 2^21003030303 is an apocalyptic number.

21003030303 is a deficient number, since it is larger than the sum of its proper divisors (7001010105).

21003030303 is an equidigital number, since it uses as much as digits as its factorization.

21003030303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7001010104.

The product of its (nonzero) digits is 162, while the sum is 15.

Adding to 21003030303 its reverse (30303030012), we get a palindrome (51306060315).

The spelling of 21003030303 in words is "twenty-one billion, three million, thirty thousand, three hundred three".