16221161571 has 16 divisors (see below), whose sum is σ = 22393263360. Its totient is φ = 10432225440.

The previous prime is 16221161549. The next prime is 16221161597. The reversal of 16221161571 is 17516112261.

It is not a de Polignac number, because 16221161571 - 2¹⁰ = 16221160547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16221161071) 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, 22266 + ... + 181488.

It is an arithmetic number, because the mean of its divisors is an integer number (1399578960).

Almost surely, 2^16221161571 is an apocalyptic number.

16221161571 is a deficient number, since it is larger than the sum of its proper divisors (6172101789).

16221161571 is a wasteful number, since it uses less digits than its factorization.

16221161571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160426.

The product of its digits is 5040, while the sum is 33.

The spelling of 16221161571 in words is "sixteen billion, two hundred twenty-one million, one hundred sixty-one thousand, five hundred seventy-one".