21030030003 has 4 divisors (see below), whose sum is σ = 28040040008. Its totient is φ = 14020020000.

The previous prime is 21030029989. The next prime is 21030030011. The reversal of 21030030003 is 30003003012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21030030003 - 2⁵ = 21030029971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21030030503) 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, 3505004998 + ... + 3505005003.

It is an arithmetic number, because the mean of its divisors is an integer number (7010010002).

Almost surely, 2^21030030003 is an apocalyptic number.

21030030003 is a deficient number, since it is larger than the sum of its proper divisors (7010010005).

21030030003 is an equidigital number, since it uses as much as digits as its factorization.

21030030003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7010010004.

The product of its (nonzero) digits is 54, while the sum is 12.

Adding to 21030030003 its reverse (30003003012), we get a palindrome (51033033015).

The spelling of 21030030003 in words is "twenty-one billion, thirty million, thirty thousand, three".