21030402203 has 4 divisors (see below), whose sum is σ = 21519481368. Its totient is φ = 20541323040.

The previous prime is 21030402193. The next prime is 21030402229. The reversal of 21030402203 is 30220403012.

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 21030402203 - 2¹⁴ = 21030385819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21030402293) 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, 244539518 + ... + 244539603.

It is an arithmetic number, because the mean of its divisors is an integer number (5379870342).

Almost surely, 2^21030402203 is an apocalyptic number.

21030402203 is a deficient number, since it is larger than the sum of its proper divisors (489079165).

21030402203 is an equidigital number, since it uses as much as digits as its factorization.

21030402203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489079164.

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 21030402203 its reverse (30220403012), we get a palindrome (51250805215).

The spelling of 21030402203 in words is "twenty-one billion, thirty million, four hundred two thousand, two hundred three".