205354421 has 8 divisors (see below), whose sum is σ = 211330944. Its totient is φ = 199444960.

The previous prime is 205354379. The next prime is 205354427. The reversal of 205354421 is 124453502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205354421 - 2¹⁰ = 205353397 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 (205354427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10520 + ... + 22833.

It is an arithmetic number, because the mean of its divisors is an integer number (26416368).

Almost surely, 2^205354421 is an apocalyptic number.

It is an amenable number.

205354421 is a deficient number, since it is larger than the sum of its proper divisors (5976523).

205354421 is a wasteful number, since it uses less digits than its factorization.

205354421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33531.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 205354421 is about 14330.1926365280. The cubic root of 205354421 is about 589.9764627209.

The spelling of 205354421 in words is "two hundred five million, three hundred fifty-four thousand, four hundred twenty-one".