205221378 has 8 divisors (see below), whose sum is σ = 410442768. Its totient is φ = 68407124.

The previous prime is 205221377. The next prime is 205221383. The reversal of 205221378 is 873122502.

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

205221378 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (205221377) 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 3 ways as a sum of consecutive naturals, for example, 17101776 + ... + 17101787.

It is an arithmetic number, because the mean of its divisors is an integer number (51305346).

Almost surely, 2^205221378 is an apocalyptic number.

205221378 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205221378 is a wasteful number, since it uses less digits than its factorization.

205221378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34203568.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 205221378 is about 14325.5498323799. The cubic root of 205221378 is about 589.8490258158.

The spelling of 205221378 in words is "two hundred five million, two hundred twenty-one thousand, three hundred seventy-eight".