21403340203 has 8 divisors (see below), whose sum is σ = 24770593280. Its totient is φ = 18113495400.

The previous prime is 21403340183. The next prime is 21403340239. The reversal of 21403340203 is 30204330412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21403340203 - 2¹³ = 21403332011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21403344203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19351473 + ... + 19352578.

It is an arithmetic number, because the mean of its divisors is an integer number (3096324160).

Almost surely, 2^21403340203 is an apocalyptic number.

21403340203 is a deficient number, since it is larger than the sum of its proper divisors (3367253077).

21403340203 is an equidigital number, since it uses as much as digits as its factorization.

21403340203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38704137.

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21403340203 its reverse (30204330412), we get a palindrome (51607670615).

The spelling of 21403340203 in words is "twenty-one billion, four hundred three million, three hundred forty thousand, two hundred three".