195238821 has 4 divisors (see below), whose sum is σ = 260318432. Its totient is φ = 130159212.

The previous prime is 195238819. The next prime is 195238859. The reversal of 195238821 is 128832591.

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 not a de Polignac number, because 195238821 - 2¹ = 195238819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 195238821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195238811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32539801 + ... + 32539806.

It is an arithmetic number, because the mean of its divisors is an integer number (65079608).

Almost surely, 2^195238821 is an apocalyptic number.

It is an amenable number.

195238821 is a deficient number, since it is larger than the sum of its proper divisors (65079611).

195238821 is an equidigital number, since it uses as much as digits as its factorization.

195238821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65079610.

The product of its digits is 34560, while the sum is 39.

The square root of 195238821 is about 13972.7885906858. The cubic root of 195238821 is about 580.1256376659.

The spelling of 195238821 in words is "one hundred ninety-five million, two hundred thirty-eight thousand, eight hundred twenty-one".