205344421 has 4 divisors (see below), whose sum is σ = 206265472. Its totient is φ = 204423372.

The previous prime is 205344409. The next prime is 205344431. The reversal of 205344421 is 124443502.

It is a happy number.

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 205344421 - 2¹¹ = 205342373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205344431) 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, 460191 + ... + 460636.

It is an arithmetic number, because the mean of its divisors is an integer number (51566368).

Almost surely, 2^205344421 is an apocalyptic number.

It is an amenable number.

205344421 is a deficient number, since it is larger than the sum of its proper divisors (921051).

205344421 is an equidigital number, since it uses as much as digits as its factorization.

205344421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921050.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 205344421 is about 14329.8437186175. The cubic root of 205344421 is about 589.9668860090.

Adding to 205344421 its reverse (124443502), we get a palindrome (329787923).

The spelling of 205344421 in words is "two hundred five million, three hundred forty-four thousand, four hundred twenty-one".