21055301543 has 2 divisors, whose sum is σ = 21055301544. Its totient is φ = 21055301542.

The previous prime is 21055301521. The next prime is 21055301551. The reversal of 21055301543 is 34510355012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21055301543 - 2⁶ = 21055301479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21055301593) 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, 10527650771 + 10527650772.

It is an arithmetic number, because the mean of its divisors is an integer number (10527650772).

Almost surely, 2^21055301543 is an apocalyptic number.

21055301543 is a deficient number, since it is larger than the sum of its proper divisors (1).

21055301543 is an equidigital number, since it uses as much as digits as its factorization.

21055301543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9000, while the sum is 29.

Adding to 21055301543 its reverse (34510355012), we get a palindrome (55565656555).

The spelling of 21055301543 in words is "twenty-one billion, fifty-five million, three hundred one thousand, five hundred forty-three".