195421 has 4 divisors (see below), whose sum is σ = 198172. Its totient is φ = 192672.

The previous prime is 195413. The next prime is 195427. The reversal of 195421 is 124591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124591 = 23 ⋅5417.

It can be written as a sum of positive squares in 2 ways, for example, as 44100 + 151321 = 210^2 + 389^2 .

It is a cyclic number.

It is not a de Polignac number, because 195421 - 2³ = 195413 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 195392 and 195401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195427) 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, 1266 + ... + 1411.

It is an arithmetic number, because the mean of its divisors is an integer number (49543).

2¹⁹⁵⁴²¹ is an apocalyptic number.

It is an amenable number.

195421 is a deficient number, since it is larger than the sum of its proper divisors (2751).

195421 is an equidigital number, since it uses as much as digits as its factorization.

195421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2750.

The product of its digits is 360, while the sum is 22.

The square root of 195421 is about 442.0644749355. The cubic root of 195421 is about 58.0306021623.

It can be divided in two parts, 195 and 421, that added together give a palindrome (616).

The spelling of 195421 in words is "one hundred ninety-five thousand, four hundred twenty-one".