21144610425165 has 64 divisors (see below), whose sum is σ = 37084763298816. Its totient is φ = 10245639462912.

The previous prime is 21144610425121. The next prime is 21144610425203. The reversal of 21144610425165 is 56152401644112.

It is not a de Polignac number, because 21144610425165 - 2¹⁰ = 21144610424141 is a prime.

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, 11209042 + ... + 12958851.

It is an arithmetic number, because the mean of its divisors is an integer number (579449426544).

Almost surely, 2^{21144610425165} is an apocalyptic number.

It is an amenable number.

21144610425165 is a deficient number, since it is larger than the sum of its proper divisors (15940152873651).

21144610425165 is a wasteful number, since it uses less digits than its factorization.

21144610425165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24168038.

The product of its (nonzero) digits is 230400, while the sum is 42.

The spelling of 21144610425165 in words is "twenty-one trillion, one hundred forty-four billion, six hundred ten million, four hundred twenty-five thousand, one hundred sixty-five".