21540060343 has 2 divisors, whose sum is σ = 21540060344. Its totient is φ = 21540060342.

The previous prime is 21540060337. The next prime is 21540060383. The reversal of 21540060343 is 34306004512.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21540060343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21540060313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10770030171 + 10770030172.

It is an arithmetic number, because the mean of its divisors is an integer number (10770030172).

Almost surely, 2^21540060343 is an apocalyptic number.

21540060343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21540060343 is an equidigital number, since it uses as much as digits as its factorization.

21540060343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 21540060343 its reverse (34306004512), we get a palindrome (55846064855).

The spelling of 21540060343 in words is "twenty-one billion, five hundred forty million, sixty thousand, three hundred forty-three".