21312347367365 has 4 divisors (see below), whose sum is σ = 25574816840844. Its totient is φ = 17049877893888.

The previous prime is 21312347367313. The next prime is 21312347367379. The reversal of 21312347367365 is 56376374321312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6884793484321 + 14427553883044 = 2623889^2 + 3798362^2 .

It is a cyclic number.

It is not a de Polignac number, because 21312347367365 - 2¹⁰ = 21312347366341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 2131234736732 + ... + 2131234736741.

It is an arithmetic number, because the mean of its divisors is an integer number (6393704210211).

Almost surely, 2^{21312347367365} is an apocalyptic number.

It is an amenable number.

21312347367365 is a deficient number, since it is larger than the sum of its proper divisors (4262469473479).

21312347367365 is an equidigital number, since it uses as much as digits as its factorization.

21312347367365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4262469473478.

The product of its digits is 11430720, while the sum is 53.

The spelling of 21312347367365 in words is "twenty-one trillion, three hundred twelve billion, three hundred forty-seven million, three hundred sixty-seven thousand, three hundred sixty-five".