21000289652543 has 2 divisors, whose sum is σ = 21000289652544. Its totient is φ = 21000289652542.

The previous prime is 21000289652519. The next prime is 21000289652579. The reversal of 21000289652543 is 34525698200012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21000289652543 - 2¹⁶ = 21000289587007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000289654543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500144826271 + 10500144826272.

It is an arithmetic number, because the mean of its divisors is an integer number (10500144826272).

Almost surely, 2^{21000289652543} is an apocalyptic number.

21000289652543 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000289652543 is an equidigital number, since it uses as much as digits as its factorization.

21000289652543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1036800, while the sum is 47.

The spelling of 21000289652543 in words is "twenty-one trillion, two hundred eighty-nine million, six hundred fifty-two thousand, five hundred forty-three".