21730450543 has 2 divisors, whose sum is σ = 21730450544. Its totient is φ = 21730450542.

The previous prime is 21730450529. The next prime is 21730450571. The reversal of 21730450543 is 34505403712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21730450543 - 2⁹ = 21730450031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21730450499 and 21730450508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21730456543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10865225271 + 10865225272.

It is an arithmetic number, because the mean of its divisors is an integer number (10865225272).

Almost surely, 2^21730450543 is an apocalyptic number.

21730450543 is a deficient number, since it is larger than the sum of its proper divisors (1).

21730450543 is an equidigital number, since it uses as much as digits as its factorization.

21730450543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50400, while the sum is 34.

The spelling of 21730450543 in words is "twenty-one billion, seven hundred thirty million, four hundred fifty thousand, five hundred forty-three".