16106336721 has 12 divisors (see below), whose sum is σ = 23832141060. Its totient is φ = 10475665920.

The previous prime is 16106336717. The next prime is 16106336731. The reversal of 16106336721 is 12763360161.

16106336721 is a `hidden beast` number, since 1 + 6 + 10 + 633 + 6 + 7 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 347300496 + 15759036225 = 18636^2 + 125535^2 .

It is not a de Polignac number, because 16106336721 - 2² = 16106336717 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16106336711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21823936 + ... + 21824673.

It is an arithmetic number, because the mean of its divisors is an integer number (1986011755).

Almost surely, 2^16106336721 is an apocalyptic number.

It is an amenable number.

16106336721 is a deficient number, since it is larger than the sum of its proper divisors (7725804339).

16106336721 is a wasteful number, since it uses less digits than its factorization.

16106336721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43648656 (or 43648653 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

Adding to 16106336721 its reverse (12763360161), we get a palindrome (28869696882).

The spelling of 16106336721 in words is "sixteen billion, one hundred six million, three hundred thirty-six thousand, seven hundred twenty-one".