21030332303 has 4 divisors (see below), whose sum is σ = 21031152720. Its totient is φ = 21029511888.

The previous prime is 21030332299. The next prime is 21030332347. The reversal of 21030332303 is 30323303012.

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 21030332303 - 2² = 21030332299 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030332353) 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, 370475 + ... + 423452.

It is an arithmetic number, because the mean of its divisors is an integer number (5257788180).

Almost surely, 2^21030332303 is an apocalyptic number.

21030332303 is a deficient number, since it is larger than the sum of its proper divisors (820417).

21030332303 is an equidigital number, since it uses as much as digits as its factorization.

21030332303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820416.

The product of its (nonzero) digits is 972, while the sum is 20.

Adding to 21030332303 its reverse (30323303012), we get a palindrome (51353635315).

The spelling of 21030332303 in words is "twenty-one billion, thirty million, three hundred thirty-two thousand, three hundred three".