21343666943 has 2 divisors, whose sum is σ = 21343666944. Its totient is φ = 21343666942.

The previous prime is 21343666909. The next prime is 21343666951. The reversal of 21343666943 is 34966634312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21343666943 - 2³⁰ = 20269925119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21343666543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671833471 + 10671833472.

It is an arithmetic number, because the mean of its divisors is an integer number (10671833472).

Almost surely, 2^21343666943 is an apocalyptic number.

21343666943 is a deficient number, since it is larger than the sum of its proper divisors (1).

21343666943 is an equidigital number, since it uses as much as digits as its factorization.

21343666943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1679616, while the sum is 47.

The spelling of 21343666943 in words is "twenty-one billion, three hundred forty-three million, six hundred sixty-six thousand, nine hundred forty-three".