21840616646065 has 8 divisors (see below), whose sum is σ = 29952845686080. Its totient is φ = 14976422842992.

The previous prime is 21840616646039. The next prime is 21840616646081. The reversal of 21840616646065 is 56064661604812.

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 21840616646065 - 2¹⁹ = 21840616121777 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21840616645997 and 21840616646015.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 312008809195 + ... + 312008809264.

It is an arithmetic number, because the mean of its divisors is an integer number (3744105710760).

Almost surely, 2^{21840616646065} is an apocalyptic number.

It is an amenable number.

21840616646065 is a deficient number, since it is larger than the sum of its proper divisors (8112229040015).

21840616646065 is an equidigital number, since it uses as much as digits as its factorization.

21840616646065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624017618471.

The product of its (nonzero) digits is 9953280, while the sum is 55.

The spelling of 21840616646065 in words is "twenty-one trillion, eight hundred forty billion, six hundred sixteen million, six hundred forty-six thousand, sixty-five".