21323312303 has 2 divisors, whose sum is σ = 21323312304. Its totient is φ = 21323312302.

The previous prime is 21323312293. The next prime is 21323312333. The reversal of 21323312303 is 30321332312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21323312303 - 2²² = 21319117999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21323312333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661656151 + 10661656152.

It is an arithmetic number, because the mean of its divisors is an integer number (10661656152).

Almost surely, 2^21323312303 is an apocalyptic number.

21323312303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323312303 is an equidigital number, since it uses as much as digits as its factorization.

21323312303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21323312303 its reverse (30321332312), we get a palindrome (51644644615).

The spelling of 21323312303 in words is "twenty-one billion, three hundred twenty-three million, three hundred twelve thousand, three hundred three".