21636166013121 has 8 divisors (see below), whose sum is σ = 31470786928224. Its totient is φ = 13112827886720.

The previous prime is 21636166013113. The next prime is 21636166013159. The reversal of 21636166013121 is 12131066163612.

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 21636166013121 - 2³ = 21636166013113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21636166013121.

It is not an unprimeable number, because it can be changed into a prime (21636166013191) 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, 327820697136 + ... + 327820697201.

It is an arithmetic number, because the mean of its divisors is an integer number (3933848366028).

Almost surely, 2^{21636166013121} is an apocalyptic number.

It is an amenable number.

21636166013121 is a deficient number, since it is larger than the sum of its proper divisors (9834620915103).

21636166013121 is a wasteful number, since it uses less digits than its factorization.

21636166013121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655641394351.

The product of its (nonzero) digits is 46656, while the sum is 39.

The spelling of 21636166013121 in words is "twenty-one trillion, six hundred thirty-six billion, one hundred sixty-six million, thirteen thousand, one hundred twenty-one".