21013312303 has 2 divisors, whose sum is σ = 21013312304. Its totient is φ = 21013312302.

The previous prime is 21013312291. The next prime is 21013312339. The reversal of 21013312303 is 30321331012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21013312303 - 2⁹ = 21013311791 is a prime.

It is a super-2 number, since 2×21013312303² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21013312393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506656151 + 10506656152.

It is an arithmetic number, because the mean of its divisors is an integer number (10506656152).

Almost surely, 2^21013312303 is an apocalyptic number.

21013312303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21013312303 is an equidigital number, since it uses as much as digits as its factorization.

21013312303 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 19.

Adding to 21013312303 its reverse (30321331012), we get a palindrome (51334643315).

The spelling of 21013312303 in words is "twenty-one billion, thirteen million, three hundred twelve thousand, three hundred three".