205075421 has 4 divisors (see below), whose sum is σ = 205302432. Its totient is φ = 204848412.

The previous prime is 205075393. The next prime is 205075433. The reversal of 205075421 is 124570502.

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 205075421 - 2¹⁴ = 205059037 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 (205075121) 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, 112145 + ... + 113958.

It is an arithmetic number, because the mean of its divisors is an integer number (51325608).

Almost surely, 2^205075421 is an apocalyptic number.

It is an amenable number.

205075421 is a deficient number, since it is larger than the sum of its proper divisors (227011).

205075421 is an equidigital number, since it uses as much as digits as its factorization.

205075421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227010.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 205075421 is about 14320.4546366378. The cubic root of 205075421 is about 589.7091557020.

The spelling of 205075421 in words is "two hundred five million, seventy-five thousand, four hundred twenty-one".