21652421245613 has 2 divisors, whose sum is σ = 21652421245614. Its totient is φ = 21652421245612.

The previous prime is 21652421245607. The next prime is 21652421245621. The reversal of 21652421245613 is 31654212425612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13855353509284 + 7797067736329 = 3722278^2 + 2792323^2 .

It is a cyclic number.

It is not a de Polignac number, because 21652421245613 - 2⁴⁰ = 20552909617837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21652421241613) 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, 10826210622806 + 10826210622807.

It is an arithmetic number, because the mean of its divisors is an integer number (10826210622807).

Almost surely, 2^{21652421245613} is an apocalyptic number.

It is an amenable number.

21652421245613 is a deficient number, since it is larger than the sum of its proper divisors (1).

21652421245613 is an equidigital number, since it uses as much as digits as its factorization.

21652421245613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 691200, while the sum is 44.

The spelling of 21652421245613 in words is "twenty-one trillion, six hundred fifty-two billion, four hundred twenty-one million, two hundred forty-five thousand, six hundred thirteen".