21116150664445 has 8 divisors (see below), whose sum is σ = 25817482322136. Its totient is φ = 16574186181696.

The previous prime is 21116150664443. The next prime is 21116150664451. The reversal of 21116150664445 is 54446605161112.

It can be written as a sum of positive squares in 4 ways, for example, as 797025774169 + 20319124890276 = 892763^2 + 4507674^2 .

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 21116150664445 - 2¹ = 21116150664443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21116150664395 and 21116150664404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21116150664443) 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, 39841793442 + ... + 39841793971.

It is an arithmetic number, because the mean of its divisors is an integer number (3227185290267).

Almost surely, 2^{21116150664445} is an apocalyptic number.

It is an amenable number.

21116150664445 is a deficient number, since it is larger than the sum of its proper divisors (4701331657691).

21116150664445 is an equidigital number, since it uses as much as digits as its factorization.

21116150664445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79683587471.

The product of its (nonzero) digits is 691200, while the sum is 46.

The spelling of 21116150664445 in words is "twenty-one trillion, one hundred sixteen billion, one hundred fifty million, six hundred sixty-four thousand, four hundred forty-five".