21343606943 has 2 divisors, whose sum is σ = 21343606944. Its totient is φ = 21343606942.

The previous prime is 21343606909. The next prime is 21343606957. The reversal of 21343606943 is 34960634312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21343606943 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21343606943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21343666943) 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, 10671803471 + 10671803472.

It is an arithmetic number, because the mean of its divisors is an integer number (10671803472).

Almost surely, 2^21343606943 is an apocalyptic number.

21343606943 is a deficient number, since it is larger than the sum of its proper divisors (1).

21343606943 is an equidigital number, since it uses as much as digits as its factorization.

21343606943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 41.

The spelling of 21343606943 in words is "twenty-one billion, three hundred forty-three million, six hundred six thousand, nine hundred forty-three".