21601677332365 has 32 divisors (see below), whose sum is σ = 28173177093600. Its totient is φ = 15805068364800.

The previous prime is 21601677332359. The next prime is 21601677332377. The reversal of 21601677332365 is 56323377610612.

It can be written as a sum of positive squares in 16 ways, for example, as 10977121954276 + 10624555378089 = 3313174^2 + 3259533^2 .

It is not a de Polignac number, because 21601677332365 - 2³⁷ = 21464238378893 is a prime.

It is a super-2 number, since 2×21601677332365² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 303918051 + ... + 303989119.

It is an arithmetic number, because the mean of its divisors is an integer number (880411784175).

Almost surely, 2^{21601677332365} is an apocalyptic number.

It is an amenable number.

21601677332365 is a deficient number, since it is larger than the sum of its proper divisors (6571499761235).

21601677332365 is a wasteful number, since it uses less digits than its factorization.

21601677332365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114097.

The product of its (nonzero) digits is 5715360, while the sum is 52.

The spelling of 21601677332365 in words is "twenty-one trillion, six hundred one billion, six hundred seventy-seven million, three hundred thirty-two thousand, three hundred sixty-five".