21320313203 has 4 divisors (see below), whose sum is σ = 24366072240. Its totient is φ = 18274554168.

The previous prime is 21320313187. The next prime is 21320313211. The reversal of 21320313203 is 30231302312.

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 21320313203 - 2⁴ = 21320313187 is a prime.

It is a super-2 number, since 2×21320313203² (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 (21320313263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1522879508 + ... + 1522879521.

It is an arithmetic number, because the mean of its divisors is an integer number (6091518060).

Almost surely, 2^21320313203 is an apocalyptic number.

21320313203 is a deficient number, since it is larger than the sum of its proper divisors (3045759037).

21320313203 is an equidigital number, since it uses as much as digits as its factorization.

21320313203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3045759036.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21320313203 its reverse (30231302312), we get a palindrome (51551615515).

The spelling of 21320313203 in words is "twenty-one billion, three hundred twenty million, three hundred thirteen thousand, two hundred three".