21113511354539 has 2 divisors, whose sum is σ = 21113511354540. Its totient is φ = 21113511354538.

The previous prime is 21113511354497. The next prime is 21113511354613. The reversal of 21113511354539 is 93545311531112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21113511354539 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21113511354539.

It is not a weakly prime, because it can be changed into another prime (21113511354139) 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, 10556755677269 + 10556755677270.

It is an arithmetic number, because the mean of its divisors is an integer number (10556755677270).

Almost surely, 2^{21113511354539} is an apocalyptic number.

21113511354539 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113511354539 is an equidigital number, since it uses as much as digits as its factorization.

21113511354539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 243000, while the sum is 44.

The spelling of 21113511354539 in words is "twenty-one trillion, one hundred thirteen billion, five hundred eleven million, three hundred fifty-four thousand, five hundred thirty-nine".