21556160535673 has 8 divisors (see below), whose sum is σ = 21921867999360. Its totient is φ = 21190464699120.

The previous prime is 21556160535661. The next prime is 21556160535677. The reversal of 21556160535673 is 37653506165512.

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 21556160535673 - 2⁴¹ = 19357137280121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21556160535677) 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, 873936 + ... + 6623902.

It is an arithmetic number, because the mean of its divisors is an integer number (2740233499920).

Almost surely, 2^{21556160535673} is an apocalyptic number.

It is an amenable number.

21556160535673 is a deficient number, since it is larger than the sum of its proper divisors (365707463687).

21556160535673 is an equidigital number, since it uses as much as digits as its factorization.

21556160535673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5813567.

The product of its (nonzero) digits is 17010000, while the sum is 55.

The spelling of 21556160535673 in words is "twenty-one trillion, five hundred fifty-six billion, one hundred sixty million, five hundred thirty-five thousand, six hundred seventy-three".