209321242 has 8 divisors (see below), whose sum is σ = 338134356. Its totient is φ = 96609792.

The previous prime is 209321239. The next prime is 209321243. The reversal of 209321242 is 242123902.

It can be written as a sum of positive squares in 2 ways, for example, as 203604361 + 5716881 = 14269^2 + 2391^2 .

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

It is not an unprimeable number, because it can be changed into a prime (209321243) 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 3 ways as a sum of consecutive naturals, for example, 4025383 + ... + 4025434.

Almost surely, 2^209321242 is an apocalyptic number.

209321242 is a deficient number, since it is larger than the sum of its proper divisors (128813114).

209321242 is a wasteful number, since it uses less digits than its factorization.

209321242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8050832.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 209321242 is about 14467.9384156831. The cubic root of 209321242 is about 593.7511097006.

The spelling of 209321242 in words is "two hundred nine million, three hundred twenty-one thousand, two hundred forty-two".