195221 has 4 divisors (see below), whose sum is σ = 210252. Its totient is φ = 180192.

The previous prime is 195203. The next prime is 195229. The reversal of 195221 is 122591.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46225 + 148996 = 215^2 + 386^2 .

It is a cyclic number.

It is not a de Polignac number, because 195221 - 2⁶ = 195157 is a prime.

It is a super-3 number, since 3×195221³ = 22320342473336583, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 195193 and 195202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7496 + ... + 7521.

It is an arithmetic number, because the mean of its divisors is an integer number (52563).

2¹⁹⁵²²¹ is an apocalyptic number.

It is an amenable number.

195221 is a deficient number, since it is larger than the sum of its proper divisors (15031).

195221 is a wasteful number, since it uses less digits than its factorization.

195221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15030.

The product of its digits is 180, while the sum is 20.

The square root of 195221 is about 441.8382056817. The cubic root of 195221 is about 58.0107986235.

It can be divided in two parts, 19 and 5221, that multiplied together give a palindrome (99199).

The spelling of 195221 in words is "one hundred ninety-five thousand, two hundred twenty-one".