21203103323 has 4 divisors (see below), whose sum is σ = 21205570848. Its totient is φ = 21200635800.

The previous prime is 21203103319. The next prime is 21203103329. The reversal of 21203103323 is 32330130212.

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 21203103323 - 2² = 21203103319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21203103295 and 21203103304.

It is not an unprimeable number, because it can be changed into a prime (21203103329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1220828 + ... + 1238073.

It is an arithmetic number, because the mean of its divisors is an integer number (5301392712).

Almost surely, 2^21203103323 is an apocalyptic number.

21203103323 is a deficient number, since it is larger than the sum of its proper divisors (2467525).

21203103323 is an equidigital number, since it uses as much as digits as its factorization.

21203103323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2467524.

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

Adding to 21203103323 its reverse (32330130212), we get a palindrome (53533233535).

The spelling of 21203103323 in words is "twenty-one billion, two hundred three million, one hundred three thousand, three hundred twenty-three".