21312013303 has 6 divisors (see below), whose sum is σ = 24791525736. Its totient is φ = 18267439932.

The previous prime is 21312013301. The next prime is 21312013313. The reversal of 21312013303 is 30331021312.

It is not a de Polignac number, because 21312013303 - 2¹ = 21312013301 is a prime.

It is a super-2 number, since 2×21312013303² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312013301) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 217469475 + ... + 217469572.

It is an arithmetic number, because the mean of its divisors is an integer number (4131920956).

Almost surely, 2^21312013303 is an apocalyptic number.

21312013303 is a deficient number, since it is larger than the sum of its proper divisors (3479512433).

21312013303 is an equidigital number, since it uses as much as digits as its factorization.

21312013303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434939061 (or 434939054 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21312013303 its reverse (30331021312), we get a palindrome (51643034615).

The spelling of 21312013303 in words is "twenty-one billion, three hundred twelve million, thirteen thousand, three hundred three".