21265082543 has 2 divisors, whose sum is σ = 21265082544. Its totient is φ = 21265082542.

The previous prime is 21265082491. The next prime is 21265082551. The reversal of 21265082543 is 34528056212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21265082543 - 2¹⁸ = 21264820399 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 21265082497 and 21265082506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21265082563) 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, 10632541271 + 10632541272.

It is an arithmetic number, because the mean of its divisors is an integer number (10632541272).

Almost surely, 2^21265082543 is an apocalyptic number.

21265082543 is a deficient number, since it is larger than the sum of its proper divisors (1).

21265082543 is an equidigital number, since it uses as much as digits as its factorization.

21265082543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 115200, while the sum is 38.

The spelling of 21265082543 in words is "twenty-one billion, two hundred sixty-five million, eighty-two thousand, five hundred forty-three".