21604144616073 has 8 divisors (see below), whose sum is σ = 32006140172000. Its totient is φ = 14402763077364.

The previous prime is 21604144616053. The next prime is 21604144616099. The reversal of 21604144616073 is 37061644140612.

21604144616073 is a `hidden beast` number, since 2 + 1 + 6 + 0 + 41 + 446 + 160 + 7 + 3 = 666.

It is not a de Polignac number, because 21604144616073 - 2⁹ = 21604144615561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21604144616023) 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, 400076752123 + ... + 400076752176.

It is an arithmetic number, because the mean of its divisors is an integer number (4000767521500).

Almost surely, 2^{21604144616073} is an apocalyptic number.

It is an amenable number.

21604144616073 is a deficient number, since it is larger than the sum of its proper divisors (10401995555927).

21604144616073 is an equidigital number, since it uses as much as digits as its factorization.

21604144616073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800153504308 (or 800153504302 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

Adding to 21604144616073 its reverse (37061644140612), we get a palindrome (58665788756685).

The spelling of 21604144616073 in words is "twenty-one trillion, six hundred four billion, one hundred forty-four million, six hundred sixteen thousand, seventy-three".