221609173036 has 24 divisors (see below), whose sum is σ = 419365550016. Its totient is φ = 102067802880.

The previous prime is 221609172949. The next prime is 221609173117. The reversal of 221609173036 is 630371906122.

It is a happy number.

221609173036 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×221609173036³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 221609173036.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34666575 + ... + 34672966.

It is an arithmetic number, because the mean of its divisors is an integer number (17473564584).

Almost surely, 2^221609173036 is an apocalyptic number.

It is an amenable number.

221609173036 is a deficient number, since it is larger than the sum of its proper divisors (197756376980).

221609173036 is a wasteful number, since it uses less digits than its factorization.

221609173036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69339609 (or 69339607 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 40.

The spelling of 221609173036 in words is "two hundred twenty-one billion, six hundred nine million, one hundred seventy-three thousand, thirty-six".