21313413943 has 2 divisors, whose sum is σ = 21313413944. Its totient is φ = 21313413942.

The previous prime is 21313413941. The next prime is 21313414007. The reversal of 21313413943 is 34931431312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21313413943 - 2¹ = 21313413941 is a prime.

It is a super-2 number, since 2×21313413943² (a number of 21 digits) contains 22 as substring.

Together with 21313413941, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21313413899 and 21313413908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21313413941) 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, 10656706971 + 10656706972.

It is an arithmetic number, because the mean of its divisors is an integer number (10656706972).

Almost surely, 2^21313413943 is an apocalyptic number.

21313413943 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313413943 is an equidigital number, since it uses as much as digits as its factorization.

21313413943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 34.

The spelling of 21313413943 in words is "twenty-one billion, three hundred thirteen million, four hundred thirteen thousand, nine hundred forty-three".