205822421 has 8 divisors (see below), whose sum is σ = 247606080. Its totient is φ = 167133888.

The previous prime is 205822403. The next prime is 205822427. The reversal of 205822421 is 124228502.

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 205822421 - 2¹⁴ = 205806037 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 (205822427) 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 7 ways as a sum of consecutive naturals, for example, 773636 + ... + 773901.

It is an arithmetic number, because the mean of its divisors is an integer number (30950760).

Almost surely, 2^205822421 is an apocalyptic number.

It is an amenable number.

205822421 is a deficient number, since it is larger than the sum of its proper divisors (41783659).

205822421 is a wasteful number, since it uses less digits than its factorization.

205822421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547563.

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 205822421 is about 14346.5125030441. The cubic root of 205822421 is about 590.4243055265.

The spelling of 205822421 in words is "two hundred five million, eight hundred twenty-two thousand, four hundred twenty-one".