16521704368381 has 8 divisors (see below), whose sum is σ = 16581397054464. Its totient is φ = 16462020923040.

The previous prime is 16521704368369. The next prime is 16521704368439. The reversal of 16521704368381 is 18386340712561.

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 16521704368381 - 2²⁹ = 16521167497469 is a prime.

It is a super-2 number, since 2×16521704368381² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16521704368681) 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, 1282185 + ... + 5889601.

It is an arithmetic number, because the mean of its divisors is an integer number (2072674631808).

Almost surely, 2^{16521704368381} is an apocalyptic number.

It is an amenable number.

16521704368381 is a deficient number, since it is larger than the sum of its proper divisors (59692686083).

16521704368381 is a wasteful number, since it uses less digits than its factorization.

16521704368381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4620371.

The product of its (nonzero) digits is 5806080, while the sum is 55.

The spelling of 16521704368381 in words is "sixteen trillion, five hundred twenty-one billion, seven hundred four million, three hundred sixty-eight thousand, three hundred eighty-one".