221964098173 has 2 divisors, whose sum is σ = 221964098174. Its totient is φ = 221964098172.

The previous prime is 221964098171. The next prime is 221964098233. The reversal of 221964098173 is 371890469122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213519774724 + 8444323449 = 462082^2 + 91893^2 .

It is a cyclic number.

It is not a de Polignac number, because 221964098173 - 2¹ = 221964098171 is a prime.

Together with 221964098171, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 221964098173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221964098171) by changing a digit.

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 as a sum of consecutive naturals, namely, 110982049086 + 110982049087.

It is an arithmetic number, because the mean of its divisors is an integer number (110982049087).

Almost surely, 2^221964098173 is an apocalyptic number.

It is an amenable number.

221964098173 is a deficient number, since it is larger than the sum of its proper divisors (1).

221964098173 is an equidigital number, since it uses as much as digits as its factorization.

221964098173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 221964098173 in words is "two hundred twenty-one billion, nine hundred sixty-four million, ninety-eight thousand, one hundred seventy-three".