21616053511541 has 8 divisors (see below), whose sum is σ = 21775462049880. Its totient is φ = 21456668555008.

The previous prime is 21616053511447. The next prime is 21616053511561. The reversal of 21616053511541 is 14511535061612.

It can be written as a sum of positive squares in 4 ways, for example, as 656861620900 + 20959191890641 = 810470^2 + 4578121^2 .

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 21616053511541 - 2³⁰ = 21614979769717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21616053511561) 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, 4053296 + ... + 7724073.

It is an arithmetic number, because the mean of its divisors is an integer number (2721932756235).

Almost surely, 2^{21616053511541} is an apocalyptic number.

It is an amenable number.

21616053511541 is a deficient number, since it is larger than the sum of its proper divisors (159408538339).

21616053511541 is a wasteful number, since it uses less digits than its factorization.

21616053511541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11790903.

The product of its (nonzero) digits is 108000, while the sum is 41.

The spelling of 21616053511541 in words is "twenty-one trillion, six hundred sixteen billion, fifty-three million, five hundred eleven thousand, five hundred forty-one".