16721334157115 has 64 divisors (see below), whose sum is σ = 24608381644800. Its totient is φ = 10646330812416.

The previous prime is 16721334157111. The next prime is 16721334157123. The reversal of 16721334157115 is 51175143312761.

It is a cyclic number.

It is not a de Polignac number, because 16721334157115 - 2² = 16721334157111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16721334157115.

It is not an unprimeable number, because it can be changed into a prime (16721334157111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 58001396 + ... + 58288974.

It is an arithmetic number, because the mean of its divisors is an integer number (384505963200).

Almost surely, 2^{16721334157115} is an apocalyptic number.

16721334157115 is a deficient number, since it is larger than the sum of its proper divisors (7887047487685).

16721334157115 is a wasteful number, since it uses less digits than its factorization.

16721334157115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288924.

The product of its digits is 529200, while the sum is 47.

Adding to 16721334157115 its reverse (51175143312761), we get a palindrome (67896477469876).

The spelling of 16721334157115 in words is "sixteen trillion, seven hundred twenty-one billion, three hundred thirty-four million, one hundred fifty-seven thousand, one hundred fifteen".