21365564716355 has 8 divisors (see below), whose sum is σ = 25710094591200. Its totient is φ = 17044840485376.

The previous prime is 21365564716351. The next prime is 21365564716403. The reversal of 21365564716355 is 55361746556312.

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 21365564716355 - 2² = 21365564716351 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21365564716294 and 21365564716303.

It is not an unprimeable number, because it can be changed into a prime (21365564716351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5951408990 + ... + 5951412579.

It is an arithmetic number, because the mean of its divisors is an integer number (3213761823900).

Almost surely, 2^{21365564716355} is an apocalyptic number.

21365564716355 is a deficient number, since it is larger than the sum of its proper divisors (4344529874845).

21365564716355 is a wasteful number, since it uses less digits than its factorization.

21365564716355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11902821933.

The product of its digits is 68040000, while the sum is 59.

The spelling of 21365564716355 in words is "twenty-one trillion, three hundred sixty-five billion, five hundred sixty-four million, seven hundred sixteen thousand, three hundred fifty-five".