21072560016165 has 64 divisors (see below), whose sum is σ = 39021590716416. Its totient is φ = 9511089702912.

The previous prime is 21072560016127. The next prime is 21072560016187. The reversal of 21072560016165 is 56161006527012.

It is not a de Polignac number, because 21072560016165 - 2¹² = 21072560012069 is a prime.

It is a super-2 number, since 2×21072560016165² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13032117 + ... + 14559573.

It is an arithmetic number, because the mean of its divisors is an integer number (609712354944).

Almost surely, 2^{21072560016165} is an apocalyptic number.

It is an amenable number.

21072560016165 is a deficient number, since it is larger than the sum of its proper divisors (17949030700251).

21072560016165 is a wasteful number, since it uses less digits than its factorization.

21072560016165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529138.

The product of its (nonzero) digits is 151200, while the sum is 42.

The spelling of 21072560016165 in words is "twenty-one trillion, seventy-two billion, five hundred sixty million, sixteen thousand, one hundred sixty-five".