21336311365 has 8 divisors (see below), whose sum is σ = 25606354680. Its totient is φ = 17067195072.

The previous prime is 21336311327. The next prime is 21336311371. The reversal of 21336311365 is 56311363312.

It can be written as a sum of positive squares in 4 ways, for example, as 3611649409 + 17724661956 = 60097^2 + 133134^2 .

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 21336311365 - 2⁷ = 21336311237 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21336311365.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180070 + ... + 274039.

It is an arithmetic number, because the mean of its divisors is an integer number (3200794335).

Almost surely, 2^21336311365 is an apocalyptic number.

It is an amenable number.

21336311365 is a deficient number, since it is larger than the sum of its proper divisors (4270043315).

21336311365 is an equidigital number, since it uses as much as digits as its factorization.

21336311365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463511.

The product of its digits is 29160, while the sum is 34.

Adding to 21336311365 its reverse (56311363312), we get a palindrome (77647674677).

The spelling of 21336311365 in words is "twenty-one billion, three hundred thirty-six million, three hundred eleven thousand, three hundred sixty-five".