21113312303 has 2 divisors, whose sum is σ = 21113312304. Its totient is φ = 21113312302.

The previous prime is 21113312291. The next prime is 21113312327. The reversal of 21113312303 is 30321331112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21113312303 - 2²⁸ = 20844876847 is a prime.

It is a super-2 number, since 2×21113312303² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21113314303) 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 as a sum of consecutive naturals, namely, 10556656151 + 10556656152.

It is an arithmetic number, because the mean of its divisors is an integer number (10556656152).

Almost surely, 2^21113312303 is an apocalyptic number.

21113312303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113312303 is an equidigital number, since it uses as much as digits as its factorization.

21113312303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21113312303 its reverse (30321331112), we get a palindrome (51434643415).

The spelling of 21113312303 in words is "twenty-one billion, one hundred thirteen million, three hundred twelve thousand, three hundred three".