21600663353 has 4 divisors (see below), whose sum is σ = 21709209600. Its totient is φ = 21492117108.

The previous prime is 21600663277. The next prime is 21600663377. The reversal of 21600663353 is 35336600612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21600663353 - 2²² = 21596469049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21600663853) by changing a digit.

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, 54272825 + ... + 54273222.

It is an arithmetic number, because the mean of its divisors is an integer number (5427302400).

Almost surely, 2^21600663353 is an apocalyptic number.

It is an amenable number.

21600663353 is a deficient number, since it is larger than the sum of its proper divisors (108546247).

21600663353 is a wasteful number, since it uses less digits than its factorization.

21600663353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108546246.

The product of its (nonzero) digits is 58320, while the sum is 35.

The spelling of 21600663353 in words is "twenty-one billion, six hundred million, six hundred sixty-three thousand, three hundred fifty-three".