16521353134271 has 16 divisors (see below), whose sum is σ = 17587535179776. Its totient is φ = 15497994210336.

The previous prime is 16521353134249. The next prime is 16521353134303. The reversal of 16521353134271 is 17243135312561.

It is a happy number.

16521353134271 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 16521353134271 - 2⁴² = 12123306623167 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 (16521353134211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70782671 + ... + 71015696.

It is an arithmetic number, because the mean of its divisors is an integer number (1099220948736).

Almost surely, 2^{16521353134271} is an apocalyptic number.

16521353134271 is a deficient number, since it is larger than the sum of its proper divisors (1066182045505).

16521353134271 is a wasteful number, since it uses less digits than its factorization.

16521353134271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141798518.

The product of its digits is 453600, while the sum is 44.

The spelling of 16521353134271 in words is "sixteen trillion, five hundred twenty-one billion, three hundred fifty-three million, one hundred thirty-four thousand, two hundred seventy-one".