21365036664352 has 24 divisors (see below), whose sum is σ = 42070578962076. Its totient is φ = 10680445181952.

The previous prime is 21365036664337. The next prime is 21365036664359. The reversal of 21365036664352 is 25346663056312.

It can be written as a sum of positive squares in 2 ways, for example, as 20120571475216 + 1244465189136 = 4485596^2 + 1115556^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21365036664352.

It is not an unprimeable number, because it can be changed into a prime (21365036664359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64618473 + ... + 64948264.

Almost surely, 2^{21365036664352} is an apocalyptic number.

It is an amenable number.

21365036664352 is a deficient number, since it is larger than the sum of its proper divisors (20705542297724).

21365036664352 is a wasteful number, since it uses less digits than its factorization.

21365036664352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129571900 (or 129571892 counting only the distinct ones).

The product of its (nonzero) digits is 13996800, while the sum is 52.

The spelling of 21365036664352 in words is "twenty-one trillion, three hundred sixty-five billion, thirty-six million, six hundred sixty-four thousand, three hundred fifty-two".