21665503116241 has 8 divisors (see below), whose sum is σ = 21927753671040. Its totient is φ = 21403281618672.

The previous prime is 21665503116221. The next prime is 21665503116253. The reversal of 21665503116241 is 14261130556612.

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 21665503116241 - 2¹¹ = 21665503114193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21665503116221) 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, 5762185 + ... + 8748358.

It is an arithmetic number, because the mean of its divisors is an integer number (2740969208880).

Almost surely, 2^{21665503116241} is an apocalyptic number.

It is an amenable number.

21665503116241 is a deficient number, since it is larger than the sum of its proper divisors (262250554799).

21665503116241 is a wasteful number, since it uses less digits than its factorization.

21665503116241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14528615.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 21665503116241 in words is "twenty-one trillion, six hundred sixty-five billion, five hundred three million, one hundred sixteen thousand, two hundred forty-one".