221909108664996 has 27 divisors (see below), whose sum is σ = 560937139501921. Its totient is φ = 73969673095104.

The previous prime is 221909108664973. The next prime is 221909108665039. The reversal of 221909108664996 is 699466801909122.

The square root of 221909108664996 is 14896614.

It is a perfect power (a square), and thus also a powerful number.

221909108664996 is a `hidden beast` number, since 2 + 21 + 9 + 0 + 9 + 108 + 6 + 6 + 499 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 158090739615396 + 63818369049600 = 12573414^2 + 7988640^2 .

It is a Duffinian 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 8 ways as a sum of consecutive naturals, for example, 88138300 + ... + 90621068.

Almost surely, 2^{221909108664996} is an apocalyptic number.

221909108664996 is the 14896614-th square number.

It is an amenable number.

221909108664996 is an abundant number, since it is smaller than the sum of its proper divisors (339028030836925).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221909108664996 is an frugal number, since it uses more digits than its factorization.

221909108664996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4965548 (or 2482774 counting only the distinct ones).

The product of its (nonzero) digits is 181398528, while the sum is 72.

The spelling of 221909108664996 in words is "two hundred twenty-one trillion, nine hundred nine billion, one hundred eight million, six hundred sixty-four thousand, nine hundred ninety-six".