21636167544557 has 8 divisors (see below), whose sum is σ = 21757315262400. Its totient is φ = 21515022885664.

The previous prime is 21636167544529. The next prime is 21636167544587. The reversal of 21636167544557 is 75544576163612.

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 21636167544557 - 2¹⁰ = 21636167543533 is a prime.

It is a super-2 number, since 2×21636167544557² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21636167544557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21636167544517) by changing a digit.

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, 14243168 + ... + 15688854.

It is an arithmetic number, because the mean of its divisors is an integer number (2719664407800).

Almost surely, 2^{21636167544557} is an apocalyptic number.

It is an amenable number.

21636167544557 is a deficient number, since it is larger than the sum of its proper divisors (121147717843).

21636167544557 is a wasteful number, since it uses less digits than its factorization.

21636167544557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529475.

The product of its digits is 127008000, while the sum is 62.

The spelling of 21636167544557 in words is "twenty-one trillion, six hundred thirty-six billion, one hundred sixty-seven million, five hundred forty-four thousand, five hundred fifty-seven".