21130313203 has 4 divisors (see below), whose sum is σ = 21445691080. Its totient is φ = 20814935328.

The previous prime is 21130313189. The next prime is 21130313209. The reversal of 21130313203 is 30231303112.

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 21130313203 - 2²¹ = 21128216051 is a prime.

It is a super-2 number, since 2×21130313203² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21130313209) 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, 157688838 + ... + 157688971.

It is an arithmetic number, because the mean of its divisors is an integer number (5361422770).

Almost surely, 2^21130313203 is an apocalyptic number.

21130313203 is a deficient number, since it is larger than the sum of its proper divisors (315377877).

21130313203 is an equidigital number, since it uses as much as digits as its factorization.

21130313203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315377876.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21130313203 its reverse (30231303112), we get a palindrome (51361616315).

The spelling of 21130313203 in words is "twenty-one billion, one hundred thirty million, three hundred thirteen thousand, two hundred three".