16106475221 has 4 divisors (see below), whose sum is σ = 16107803244. Its totient is φ = 16105147200.

The previous prime is 16106475211. The next prime is 16106475241. The reversal of 16106475221 is 12257460161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12257460161 = 1511 ⋅8112151.

It can be written as a sum of positive squares in 2 ways, for example, as 9966028900 + 6140446321 = 99830^2 + 78361^2 .

It is a cyclic number.

It is not a de Polignac number, because 16106475221 - 2⁶ = 16106475157 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 (16106475211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 645650 + ... + 670131.

It is an arithmetic number, because the mean of its divisors is an integer number (4026950811).

Almost surely, 2^16106475221 is an apocalyptic number.

It is an amenable number.

16106475221 is a deficient number, since it is larger than the sum of its proper divisors (1328023).

16106475221 is a wasteful number, since it uses less digits than its factorization.

16106475221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328022.

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 16106475221 in words is "sixteen billion, one hundred six million, four hundred seventy-five thousand, two hundred twenty-one".