221608193 has 4 divisors (see below), whose sum is σ = 224413440. Its totient is φ = 218802948.

The previous prime is 221608103. The next prime is 221608199. The reversal of 221608193 is 391806122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221608193 - 2²⁶ = 154499329 is a prime.

It is a super-2 number, since 2×221608193² = 98220382409450498, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221608199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1402505 + ... + 1402662.

It is an arithmetic number, because the mean of its divisors is an integer number (56103360).

Almost surely, 2^221608193 is an apocalyptic number.

It is an amenable number.

221608193 is a deficient number, since it is larger than the sum of its proper divisors (2805247).

221608193 is an equidigital number, since it uses as much as digits as its factorization.

221608193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2805246.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 221608193 is about 14886.5104373053. The cubic root of 221608193 is about 605.1484670807.

The spelling of 221608193 in words is "two hundred twenty-one million, six hundred eight thousand, one hundred ninety-three".