21305845884613 has 8 divisors (see below), whose sum is σ = 21652795777536. Its totient is φ = 20960197868400.

The previous prime is 21305845884607. The next prime is 21305845884619. The reversal of 21305845884613 is 31648854850312.

It is an interprime number because it is at equal distance from previous prime (21305845884607) and next prime (21305845884619).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21305845884613 - 2³⁷ = 21168406931141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21305845884619) 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 in 7 ways as a sum of consecutive naturals, for example, 325436181 + ... + 325501642.

It is an arithmetic number, because the mean of its divisors is an integer number (2706599472192).

Almost surely, 2^{21305845884613} is an apocalyptic number.

It is an amenable number.

21305845884613 is a deficient number, since it is larger than the sum of its proper divisors (346949892923).

21305845884613 is an equidigital number, since it uses as much as digits as its factorization.

21305845884613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650938355.

The product of its (nonzero) digits is 22118400, while the sum is 58.

The spelling of 21305845884613 in words is "twenty-one trillion, three hundred five billion, eight hundred forty-five million, eight hundred eighty-four thousand, six hundred thirteen".