21573763543 has 2 divisors, whose sum is σ = 21573763544. Its totient is φ = 21573763542.

The previous prime is 21573763529. The next prime is 21573763559. The reversal of 21573763543 is 34536737512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21573763543 - 2¹³ = 21573755351 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21573763493 and 21573763502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21573763513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10786881771 + 10786881772.

It is an arithmetic number, because the mean of its divisors is an integer number (10786881772).

Almost surely, 2^21573763543 is an apocalyptic number.

21573763543 is a deficient number, since it is larger than the sum of its proper divisors (1).

21573763543 is an equidigital number, since it uses as much as digits as its factorization.

21573763543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1587600, while the sum is 46.

The spelling of 21573763543 in words is "twenty-one billion, five hundred seventy-three million, seven hundred sixty-three thousand, five hundred forty-three".