21343362365 has 12 divisors (see below), whose sum is σ = 27733742964. Its totient is φ = 15761251584.

The previous prime is 21343362343. The next prime is 21343362367. The reversal of 21343362365 is 56326334312.

It can be written as a sum of positive squares in 6 ways, for example, as 6524439076 + 14818923289 = 80774^2 + 121733^2 .

It is not a de Polignac number, because 21343362365 - 2³⁰ = 20269620541 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 (21343362367) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12628364 + ... + 12630053.

It is an arithmetic number, because the mean of its divisors is an integer number (2311145247).

Almost surely, 2^21343362365 is an apocalyptic number.

It is an amenable number.

21343362365 is a deficient number, since it is larger than the sum of its proper divisors (6390380599).

21343362365 is a wasteful number, since it uses less digits than its factorization.

21343362365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25258448 (or 25258435 counting only the distinct ones).

The product of its digits is 233280, while the sum is 38.

Adding to 21343362365 its reverse (56326334312), we get a palindrome (77669696677).

The spelling of 21343362365 in words is "twenty-one billion, three hundred forty-three million, three hundred sixty-two thousand, three hundred sixty-five".