21641251336161 has 8 divisors (see below), whose sum is σ = 30373686085920. Its totient is φ = 13668158738592.

The previous prime is 21641251336153. The next prime is 21641251336171. The reversal of 21641251336161 is 16163315214612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21641251336161 - 2³ = 21641251336153 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21641251336171) 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, 189835537980 + ... + 189835538093.

It is an arithmetic number, because the mean of its divisors is an integer number (3796710760740).

Almost surely, 2^{21641251336161} is an apocalyptic number.

It is an amenable number.

21641251336161 is a deficient number, since it is larger than the sum of its proper divisors (8732434749759).

21641251336161 is a wasteful number, since it uses less digits than its factorization.

21641251336161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379671076095.

The product of its digits is 155520, while the sum is 42.

The spelling of 21641251336161 in words is "twenty-one trillion, six hundred forty-one billion, two hundred fifty-one million, three hundred thirty-six thousand, one hundred sixty-one".